水文四等水准测量使用符合水准路线时，可只进行（）测量。
A、单程
B、双程
C、往返
D、双向}
参考答案：A
下列微粒符号表示2个氧分子的是
A．2O
B．2O2
C．O2
D．O2-
Which of the following is NOT true about religious leaders().
A.They usually assumed the task of the enactment of the rites.
B.They often acted other people, animals, or supernatural beings.
C.They often separated those dramatic representations from religious activities.
D.They often mimed the desired effect -- success in hunt or battle, the coming rain.
