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【单选题】
焊缝金属中的硫会导致( ).A.
高温脆性
B.
低温脆性
C.
产生冷裂纹
D.
未熔合
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举一反三
【单选题】What is the main purpose of this passage?
A.
To look back to the early days of computers.
B.
To explain what technical problems may occur with computers.
C.
To discourage unnecessary investment in computers.
D.
To warn against a mentally lazy attitude towards computers.
【简答题】读三幅不同时期的京杭大运河图，并回答下列问题： 1.对比图，结合所学知识，指出隋朝、元朝时期大运河河道变化是______________。原因是。 2.京杭运河自北向南沟通了________、________、________、________和________五大水系，在世界上的地位是________________________。 3.京杭大运河属于________景观。该景观与自然环境的关...
【单选题】Which of the following is not the purpose of wound dressing?
A.
Isolate the wound from the environment to reduce the chance of contamination.
B.
Relieve the pain and relieve the tension of the wounded.
C.
A pressure bandage can be used to stop the bleeding.
D.
Remove the internal organs back to the wound and then bandage, so as not to expose the internal organs to aggravate the injury.
【简答题】I think the purpose of the government goes back to Rome and Greece, where people would try to do the best for the _____ of the people and keep_____ liberty, but yet keep _____ among the people.
【单选题】受体阻断剂(拮抗剂)的特点是:
A.
对受体无亲合力,无效应力
B.
对受体有亲合力和效应力
C.
对受体有亲合力而无效应力
D.
对受体无亲合力和效应力 E对受体单有亲合力
【单选题】Which of the following terms is defined as a back-up power source that provides power to radio installations for the purpose of conducting distress and safety communications when the vessel'main and e...
A.
Emergency back-up generator
B.
Reserve source of energy.
C.
Reserve source of diesel power
D.
Emergency diesel generator
【单选题】There are cords around the waists of the bungee flyers. The purpose of the cords is to ____.
A.
guarantee the safety of the performers
B.
let the performers swing back and forth
C.
add a little extra safety
【单选题】The purpose of back grind is ( )
A.
good looking
B.
testing
C.
appropriate dimension
D.
attach
相关题目：
【单选题】受体阻断剂(拮抗剂)的特点是:
A.
对受体无亲合力,无效应力
B.
对受体有亲合力和效应力
C.
对受体有亲合力而无效应力
D.
对受体无亲合力和效应力 E对受体单有亲合力
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