偏心竖向力作用下，单桩竖向承载力应满足的条件是（）
A.Qk≤Ra
B.≤1.2Ra
C.Qk≤Ra且≤1.2Ra
D.≥0
参考答案：C
The math problem seems very easy, but in fact it is very difficult_______.
A．to work out
B．being worked out
C．working out
D．to be worked out.
考评者对被考评者容易心存顾虑，致使考评的结果缺乏客观公正性的绩效考评方式是( )。
A．(A) 上级考评
B．(B) 同级考评
C．(C) 下级考评
D．(D) 自我考评
≤1.2Ra≤1.2Ra
≥0
≤1.2Ra≤1.2Ra≥0