安全压杠必须有足够的锁紧力,当自动开启装置失效时,应()打开。
A、不能手动;
B、能够手动;
C、视设备型号而定。
参考答案:B
Which of the following is NOT accurate about the Spaniards injured in the blasts a. None of them were seriously wounded. b. They were buried by the debris after the explosion. c. They didn’t want their names or ages released. d. They stayed at the same hotel.
治疗指数大的药物相对较治疗指数小的药物安全。