皮皮学，免费搜题
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【单选题】
对于安全带系统来说,如果无锁止功能,整个( )安全带和安全带锁。A.
维修
B.
清洁
C.
更换
D.
保养
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】蛋白质所形成的胶体颗粒,在下列哪种条件下不稳定
A.
溶液 pH值大于PI
B.
溶液 pH值小于PI
C.
溶液 pH值等于PI
D.
溶液 pH值等于7.4
E.
在水溶液中
【单选题】听力原文：Operator: Hello. This is the emergency 911 operator. Taxi Driver: Help. Help. Please help me! Operator: Yes sir. Please calm down and explain exactly what is happening. Taxi Driver: Calm down! My...
A.
A taxi driver.
B.
A bus driver.
C.
A college student.
D.
A dustman.
【单选题】This train is entirely automatic; there is no driver, but a mechanic is always available in case anything ____ go wrong.
A.
will
B.
should
C.
would
D.
shall
【多选题】In neolithic era, people could make ( ).
A.
bronze needle
B.
stone knives
C.
stone knives
D.
iron instruments
E.
gold needle
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