桩身质量检测常用的方法有()。
A.小应变法
B.声波透射法
C.取芯法
D.静载试验
参考答案:A, B, C
The little boy came riding full speed down the motorway on his bicycle _________it was! [ ]
A. What a dangerous scene
B. What dangerous a scene
C. How a dangerous scene
D. How dangerous the scene
斯金纳认为,人和动物的行为有两类:应答行为和 。