问题
单项选择题
钻具应配备（）
A.单管钻具
B.双动双管钻具
C.单动双管钻具
答案
参考答案：C
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钻具应配备（）
A.单管钻具
B.双动双管钻具
C.单动双管钻具
参考答案：C
| 阅读理解。 | |
for one to cross at a time. Meeting at the middle of the bridge, neither would give the way to the other. They locked horns, and fought for the right of way, until both fell into the torrent below and were drowned. | |
| 1. The goats _____________ the bridge. | |
| A. was crossing B. have crossed C. were crossing | |
| 2. The bridge was _____________. | |
| A. wide B. rude C. smooth | |
| 3. They fought _____________ their horns. | |
| A. in B. with C. use | |
| 4. The goats were fighting at the _____________ of the bridge. | |
| A. middle B. front C. back |