皮皮学，免费搜题
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【单选题】
针对设计基准事故而设计的安全设施称为:A.
保护系统
B.
安全系统
C.
专设安全设施
D.
事故缓解设施
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】_________ with the work,she sat down to have a break. [ ]
A.
To tire
B.
Tire
C.
Being tired
D.
Tired
【单选题】____ almost the whole time of mine, the work made me extremely tired.
A.
Occupying
B.
Occupied
C.
Being occupied
D.
To occupy
【单选题】______ tired, after a hard work, she fell into bed and went straight to sleep.
A.
Felt
B.
Feeling
C.
Being felt
D.
To feel
【单选题】Local residents tired hard to protect this ______ of elephants from being killed.
A.
crowd
B.
school'
C.
herd
D.
flock
【简答题】微波的频率范围？
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