旋喷桩独立基础下桩数不应少于（）。
A.2根
B.3根
C.4根
D.5根
参考答案：C
10.9级高强度螺栓抗拉强度为（）。
A.660MPa
B.830MPa
C.940MPa
D.1040MPa
Without my glasses, I couldn't _______ whether that figure on the blackboard was a three or an eight.[ ]
A. make out
B. make up
C. make for
D. make off
