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【单选题】
B水泥中的含碱量按()在水泥中的百分率来表示。A.
Na2O
B.
K2O
C.
Na2O+0.658K2O
D.
Na2O+K2O
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【简答题】阅读理解。 (I) Recently, a solar powered plane took to the sky for the first time. It had passed an important test on the way to travel around the world. The plane took off from an airport in Switzerland a...
【多选题】What kind of bugs should test engineers not be responsible for?
A.
The software is difficult to understand, hard to use, slow, or-in the software tester's eyes-will he viewed by the end user as just plain not right
B.
The software doesn't do something that the product specification says it should do
C.
The software does something that the product specification says it shouldn't do
D.
The software does something that the product specification doesn't mention
E.
The software doesn't do something that the product specification doesn't mention but should.
【单选题】Who will weld the test pieces?
A.
Any welders
B.
Engineers
C.
The most skillful welders.
D.
The inspectors
【单选题】液力传动主要有以下特点:1自动适应性;2防振、隔振性能;3( )。此外,液力传动还具有过载保护、自动协调、分配负载的功能。但是,液力传动效率较低,高效范围较窄,需要增设冷却补偿系统,结构复杂、成本高。
A.
直接性
B.
间接性
C.
穿透性
D.
透穿性
【单选题】What is the difficulty in the development of NextGen?
A.
It will take a long time to test the system.
B.
There are not enough engineers.
C.
It will cost a lot of money.
D.
Controllers may not know how to use it.
【简答题】试设计控制两台三相异步电动机的电气控制系统(包括主电路、控制电路),要求:起动时,电动机 M1起动后,电动机M2才能起动;停止时,M1、M2可同时停止和分别停止;电动机M2还具有点动控制功能。有短路保护和过载保护。
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