380/220V低压供电系统是指（）。A、线电压220V，相电压380V B、线电压

红色的玻璃只能透过______光；我们将______、______、______三色光叫做光的三原色．

休克属于中医的

A．血虚证

B．气虚证

C．痰凝证

D．气滞证

E．脱证

如图，动物园的水平地面上放着一只质量为M的笼子，笼内有一只质量为m的猴子，当猴以某一加速度沿竖直柱子加速向上爬时，笼子对地面的压力为F₁；当猴以同样大小的加速度沿竖直柱子加速下滑时，笼子对地面的压力为F₂，关于F₁和F₂的大小，下列判断中正确的是（　　）

A．F₁=F₂

B．F₁＞（M+m）g，F₂＞（M+m）g

C．F₁+F₂=2（M+m）g

D．F₁-F₂=2（M+m）g

在队列研究分析阶段，利用分层分析和多因素分析模型，主要是为了控制（）

A.选择偏倚

B.信息偏倚

C.失访偏倚

D.混杂偏倚

E.回忆偏倚

The heat generated by the operating system war between rivals IBM Corp. and Microsoft Corp. is (21) .
Windows 95 and OS/2 introduce a new (22) . Both systems claim to multitask legacy DOS and 16-bit Windows applications. However, only OS/2 can provide full memory (crash) protection for these legacy applications because it is capable of running each DOS and Windows application within its full-protected memory address space.
Windows 95 will run all current Windows applications in the same shared- memory address space, affording full memory protection only to the (23) 32-bit Windows 95 applications. In other word, Windows 95 users will have to (24) their current Windows applications to Windows 95 version to match the memory protection OS/2 now delivers.
While OS/2 does afford superior memory protection and multitasking for legacy DOS and Windows applications, it will not be able to run any Windows 95 applications. IBM may address this (25) in an update of the OS but has no present plans to do so.

A．place

B．environment

C．condition

D．action