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【单选题】
焊前预热工艺措施的主要目的是降低焊缝的冷却速度,减小焊接应力,减少淬硬组织,防止( )的产生,改善焊接接头的性能。A.
焊瘤
B.
咬边
C.
裂纹
D.
未焊透
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反馈参考答案：
举一反三
【单选题】---Do you need any help with the box? ---No, thank you. I can _____ to make it.
A.
want
B.
hope
C.
allow
D.
manage
【单选题】—Please read every sentence carefully. you are, mistakes you’ll make. —Thank you for your advice.
A.
The more carefully; the fewer
B.
The more careful; the less
C.
The more carefully; the less
D.
The more careful; the fewer
【单选题】—Be careful, _____ you will make mistakes in your exam. —I know that. Thank you. [ ]
A.
and
B.
or
C.
nor
【单选题】---It’s good for you to _______ in class. --- I think so. Thank you.
A.
get into trouble
B.
make a lot of noise
C.
laugh at others
D.
take notes
【单选题】–Do you have some trouble ____ the problem? Do you need some help? --No, thank you. I can make it myself.
A.
solve
B.
solving
C.
to solve
D.
solved
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