在古代旅游活动中，司马迁、玄奘、李时珍、徐霞客等人从事的“行万里路，读万卷书”式的旅

电梯机房的噪声平均值应不大于（）dB（）。

A．55

B．65

C．80

D．85

They _______ on the program for almost one week before I joined them,and now we _______ it as no good results have come out so far.

A．had been working; are still working

B．had worked; were still working

C．have been working; have worked

D．have worked; are still working

简述1951年《幼儿园暂行规程》和《幼儿园暂行教学纲要》所规定的幼儿园的培养目标。

溶出度合格的制剂其崩解时限一定合格，反之，崩解度合格的制剂溶出度也合格。

男大衣下摆造型多为（）。

A、圆角型

B、方角型

C、斜角型

D、不确定