测量人员所采集的原始数据记录只能使用（）填写。
A、钢笔或铅笔
B、钢笔或签字笔
C、铅笔或签字笔
D、钢笔或毛笔
参考答案：B
—Look! What is over there?
—Oh, dear! The house is on fire. Let's call quickly. [ ]
A. happening, 120
B. happening, 119
C. happened, 110
防止水泵发生汽蚀可采用哪些方法？
