机房设备安装应有抗地震措施,机架及设备进行抗震加固,要达到抵抗里氏()级。
A.5
B.6
C.7
D.8
参考答案:C
The doctor asked him not to leave his wound . [ ]
A. exposed
B. to expose
C. to be exposed
D. exposing
橡胶的使用温度过高时,会加速橡胶(),破坏橡胶与金属的(),导致橡胶脱落。