18:["$","div",null,{"className":"grid gap-4 lg:grid-cols-[minmax(0,1fr)_minmax(16rem,20rem)] lg:items-start lg:gap-6","children":[["$","article",null,{"className":"surface-card animate-enter px-3.5 py-5 shadow-card sm:px-7 sm:py-8","children":[["$","header",null,{"className":"mb-4 flex flex-wrap items-center gap-2 sm:mb-5","children":[["$","span",null,{"className":"chip","children":"【单选题】"}],["$","span",null,{"className":"text-xs tabular-nums text-muted-foreground sm:text-sm","children":"2 / 8"}]]}],["$","h1",null,{"className":"rich-html min-w-0 max-w-full break-words text-base leading-relaxed text-slate-800 break-words text-lg font-medium leading-relaxed tracking-tight text-foreground sm:text-xl sm:leading-relaxed","dangerouslySetInnerHTML":{"__html":"

等截面杆远端固定时，S 与 C 分别为？

"}}],["$","ol",null,{"className":"mt-4 space-y-2.5 sm:mt-5 sm:space-y-3","children":[["$","li","2083609034279096320",{"children":["$","div",null,{"className":"flex min-w-0 items-start gap-2.5 rounded-xl border px-3 py-2.5 text-sm leading-relaxed sm:gap-3 sm:px-3.5 sm:py-3 sm:text-base border-border bg-surface text-slate-700","children":[["$","span",null,{"className":"inline-flex h-7 w-7 shrink-0 items-center justify-center rounded-full border text-xs font-semibold tabular-nums sm:h-8 sm:w-8 sm:text-sm border-border-strong bg-muted text-slate-600","aria-hidden":"true","children":"A"}],["$","div",null,{"className":"rich-html min-w-0 max-w-full break-words text-base leading-relaxed text-slate-800 min-w-0 flex-1 pt-0.5 !text-inherit !leading-[inherit] [&_p]:my-0","dangerouslySetInnerHTML":{"__html":"

$3i$ 与 0

"}}],null]}]}],["$","li","2083609035180871680",{"children":["$","div",null,{"className":"flex min-w-0 items-start gap-2.5 rounded-xl border px-3 py-2.5 text-sm leading-relaxed sm:gap-3 sm:px-3.5 sm:py-3 sm:text-base border-success bg-success-soft text-slate-800","children":[["$","span",null,{"className":"inline-flex h-7 w-7 shrink-0 items-center justify-center rounded-full border text-xs font-semibold tabular-nums sm:h-8 sm:w-8 sm:text-sm border-success bg-success text-white","aria-hidden":"true","children":"B"}],["$","div",null,{"className":"rich-html min-w-0 max-w-full break-words text-base leading-relaxed text-slate-800 min-w-0 flex-1 pt-0.5 !text-inherit !leading-[inherit] [&_p]:my-0","dangerouslySetInnerHTML":{"__html":"

$4i$ 与 0.5

"}}],["$","span",null,{"className":"shrink-0 pt-0.5 text-xs font-medium text-success sm:text-sm","children":"正确"}]]}]}],["$","li","2083609036040704000",{"children":["$","div",null,{"className":"flex min-w-0 items-start gap-2.5 rounded-xl border px-3 py-2.5 text-sm leading-relaxed sm:gap-3 sm:px-3.5 sm:py-3 sm:text-base border-border bg-surface text-slate-700","children":["$L1b","$L1c",null]}]}],"$L1d"]}],"$L1e"]}],"$L1f"]}]

等截面杆远端固定时，S 与 C 分别为？

参考答案

参考解析