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【单选题】
压力表与压力容器之间，应装设三通旋塞或针形阀；三通旋塞或针形阀上应有开启标记和锁紧装置；压力表与压力容器之间，（）连接其他用途的任何配件或接管。A.
不得
B.
可以
C.
必要时可以
D.
经批准可以
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反馈参考答案：
举一反三
【简答题】按车桥上车轮的不同运动方式,车桥可分为 、 、 和 。
【单选题】. He is very popular among his students as he always tries to make them __________ in his lectures.
A.
interested
B.
interesting
C.
interest
D.
to interest
【判断题】ISO 9000系列标准的发布，使得各国的质量管理和质量保证的概念、原则、方法和程序统一在国际标准的基础上，标志着质量管理走向规范化、程序化的新高度。
A.
正确
B.
错误
【单选题】He ______ conscious of his duties to his parents as a filial son.
A.
was and always will be
B.
has to be and always will be
C.
had been and always will be
D.
has been and always will be
【单选题】He is very popular among his students as he always tries to make them in his lectures.
A.
interesting
B.
interested
C.
interest
D.
to interest
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