下列哪些预防措施符合事故预防的坚固性原则()
A、压力容器的卸压阀
B、加大安全系数
C、提高结构强度
D、利用变压器降低回路电压
E、减少安全系数
参考答案:B, C
— Attention, please. The plane has to be ______ because of the heavy rain.
— Oh, bad luck! We have to wait now. [ ]
A. put on
B. put off
C. put up
D. put away
《灵枢·五色》中的“藩”是指()
A.耳门
B.眉间
C.鼻
D.颊侧
E.前额