单元测试

1、填空题：
With ______ to application, all dies fall into cutting and shaping dies.‌‌‌‌
答案: 【 respect】

2、填空题：
‎Classification according to applications
covers the number of operations that can _______ performed by means of one die‌
答案: 【 be】

3、填空题：
‏ the work is _____ upwards and then removed by a positive knockout‎
答案: 【 ejected】

4、填空题：
‍The die design should suit the scale of
production it will ____ used for……​
答案: 【 be】

5、填空题：
the working parts of the die must ____ adequately strong, durable in operation, and easily replaceable when worn out​‍​
答案: 【 be】

6、填空题：
‍Alloy steels may be ______ as steels with alloying elements that exceed one or more of the following limits‏
答案: 【 defined】

7、填空题：
‌and
containing _________ of the following elements‌
答案: 【 one or more】

8、填空题：
‍The
nominal chemical composition of the standard AISI alloy steels ______ given.‌
答案: 【 were】

9、填空题：
​alloy
steels may be classified ______ through-hardenableand surface-hardenable‏
答案: 【 as】

10、填空题：
‌One
reason for the widespread use of the alloy steels in the lower carbon range,
such as 4024 and 4028, is ______ good machinability  _______obtained. ‌
答案: 【 that
is】

阶段测试

1、填空题：
‌An open-loop circuit or system is
one in which feedback_______not employed‌
答案: 【 is】

2、填空题：
‌The performance characteristics
of the circuit are determined by the characteristics of the individual
components ______ and their interaction in the circuit. ‎
答案: 【 used】

3、填空题：
The purpose of _________ is to regulate the energy transfer rate ‌‌by regulating the flow rate in a circuit or branch of a circuit.‌‍‌
答案: 【 flow control】

4、填空题：
‏Method by ________ Open-Loop Circuits
Achieve Control‌
答案: 【 which】

5、填空题：
Pump control implies one of two control ‎methods,depending on which type of pump is ‎‏_____________. ‎‏‎
答案: 【 used】

阶段测试

1、填空题：
‎rigid frame _______ which all the other basic components are mounted‏
答案: 【 on】

2、填空题：