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【单选题】
下列关于运动关系的说法中,正确的是:
A.
没有外力作用时,物体不会运动,这是牛顿第一定律的体现
B.
物体受力越大,运动的越快,这是符合牛顿第二定律的
C.
物体所受合外力为零,则速度一定为零;物体所受合外力不为零,则其速度也一定不为零
D.
物体所受的合外力最大时,而速度却可以为零;物体所受的合外力最小时,而速度却可以最大
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参考答案:
举一反三
【单选题】Sludge may form in the crankcase of an air conditioning compressor as a result of ______.
A.
bubbling refrigerant
B.
overheating and oxidation
C.
lowered operating temperatures
D.
reducing the cloud or floc point
【单选题】Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ()
A.
refrigerant bubbles in the lube oil
B.
refrigerant reducing the lube oil viscosity
C.
oxidation of the lube oil from overheating
D.
reducing the floc or cloud point of the oil
【多选题】歇山顶是( )的结合,由一条正脊、四条垂脊、四条俄脊组成,又称九脊顶。
A.
庑殿顶
B.
悬山顶
C.
硬山顶
D.
攒尖顶
E.
盝顶
【判断题】歇山顶是由一条正脊、四条垂脊、和四条戗脊组成,又称为九脊顶。
A.
正确
B.
错误
【单选题】Sludge may form. in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of ______.
A.
wax precipitation in the lube oil
B.
contamination by dust, scale, or moisture
C.
refrigerant bubbles in the lube oil
D.
refrigerant reducing the lube oil viscosity
【判断题】新立题材的市场号召力较强。
A.
正确
B.
错误
【单选题】Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of_____.
A.
refrigerant bubbles in the Iube oil
B.
refrigerant reducing the lube oil viscosity
C.
oxidation of the lube oil from overheating
D.
reducing the floc or cloud point of the oil
【单选题】由一条正脊、四条垂脊、四条戗脊组成,又称九脊顶的屋顶形式是( )。
A.
重檐庑殿顶
B.
歇山顶
C.
庑殿顶
D.
重檐歇山顶
【单选题】会展新立题材的优点有
A.
筹备工作便于开展
B.
市场号召力较强
C.
开发新的专业观众
D.
拓展新的投资空间
【单选题】Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.
A.
refrigerant bubbles in the lube oil
B.
refrigerant reducing the lube oil viscosity
C.
oxidation(氧化) of the lube oil from overheating
D.
reducing the floc or cloud point of the oil
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