木工机械开关控制有哪些规定？
参考答案：
木工机械均不得使用倒顺开关控制。
I want to help the people who are sick, so I want to be a _______.[ ]
A. worker
B. teacher
C. waiter
D. doctor
CT透视扫描仪的球管电压范围是（）
A.0.8～1.2kVp
B.8～12kVp
C.80～120kVp
D.400～800kVp
E.800～1200kVp
ant to help the people who are sick, so I want to be a _______.[ ]