Isn’t it time you got down to________the papers? A．mark B．be marked C．being marked D．marking
（4分）为了确保用药安全，购买药品时，我们可以先看包装盒上的说明。下图是和胃整肠丸包装盒上的说明，请据图回答：（1）此药适合于治疗
Is there a “success personality”? Some winning combination of qualities that leads almost naturally to achievement? If so, exactly what is that secret success formula, and can anyone develop it? A
f(x)=(1+x)+(1+x)2+(1+x)3+…+(1+x)10.(1)求f(x)展开式中x3的系数；(2)求f(x)展开式中各项系数之和.
用如图8所示的滑轮组来提升重物，已知物重为200N，人用125N的力将物体在5秒内拉升2m，求：（1）人拉绳做的功和拉力的功率；（2）该滑轮组的机械效率
下列关于烷烃性质的叙述正确的是( ) A．烷烃分子中碳原子不可能在同一平面上 B．烷烃易被酸性高锰酸钾溶液氧化 C．在光照条件下，烷烃易与溴水发
----Why are you late ? ----sorry, the bus I took ______ the mud for half an hour, so I had to walk here. A. had stuck in B. has stuck in C. was stuck in D. has been stuck in
在制备抗蛇毒毒素血清时，需将减毒的蛇毒注入马的体内，引起免疫反应，这一免疫反应和所用的蛇毒分别属于 ( ) A．非特异性免疫、抗原
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