【单选题】People in ancient Greece understood that______.
A.
some tree bark and leaves could be used as aspirin
B.
some tree bark and leaves had certain medical effects
C.
aspirin was a good pain killer
D.
aspirin could cure arthritis
【简答题】There is nothing new about people cutting down trees. In ancient times, Greece, Italy, and Great Britain were covered with forests. Over the centuries those forests were gradually cut back, until now ...
【单选题】执行M O V I E,#81H指令的意义是
【单选题】执行M O V I E,#81H指令的意义是:( )
【单选题】关于电导率仪的使用,下面哪一点叙述不正确
A.
把“温度”钮置于25℃刻度线时,测定值是溶液在测量温度下的电导率值
B.
需要调节“常数校正”,使仪器显示出电导池系数的数值
【简答题】计算下列三重积分: 1 、 ,其中 是由曲面 及平面 所围成的闭区域. 2 、 ,其中 由不等式 所确定. 3 、 , 其中 .