八达岭长城的主峰海拔（）米。
A.1015
B.1085
C.1115
参考答案：A
----Do you like______a doctor for the children?
----Yes. To be a children’s doctor is rewarding.
A．be
B．being
C．are
D．become
一个电容器标注为G3，通过查表，查出G=1.8，3=103，那么，这个电容器的标称值为（）。
A.1.8pF
B.1.8*103pF
C.1800pF
D.1.8103pF
