当货叉到达中位时,左右区缺少一个会引起()
A.货叉左区右区开关故障
B.货叉中位停叉开关故障
C.左右歪斜检测开关故障
D.货叉上叉检测开关故障
参考答案:A
The place was flooded ________ it had been raining for several weeks.[ ]
A. because
B. because of
C. ever since
D. as a result of
超声波疗法的临床应用和相对禁忌证是什么?