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【判断题】
苯不容易发生加成反应,难以被氧化,易发生环上氢原子的取代反应。A.
正确
B.
错误
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反馈参考答案：
举一反三
【多选题】有关主动脉描述,下列正确的是(
A.
由左心室发出
B.
穿膈主动脉裂孔人腹腔
C.
至第5腰椎下缘处分为左、右髂总动脉
D.
分为升主动脉、主动脉弓和降主动脉
E.
是体循环的动脉主干
【单选题】What is TRUE of pressure/vacuum valves?
A.
They are designed to provide for the flow of small volumes of tank atmospheres caused by thermal variations in a cargo tank
B.
They should operate in advance of the pressure/vacuum breakers
C.
They should be kept in good working order by regular inspection and cleaning
D.
All of the above
【单选题】According to the talk, which of the following is true about its market?
A.
It's getting smaller every year.
B.
It's increasing rapidly.
C.
It's expanding only in Japan.
【简答题】PLC 按硬件结构分类,可以分为 和 两种。
【简答题】持拍队员的训练方式主要有移动能力、弹跳能力、( )和配合。
【单选题】What eventually happened to the phone company?
A.
It became a huge company.
B.
It allowed smaller companies to offer service.
C.
It was taken over by the government.
D.
It was profitable.
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