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【简答题】
用中文简述一下该段的意思: No matter how those who seek to bash China try to justify their attacks, the country's rigorous efforts to end the epidemic will continue. Those opting to attack China at this time should bear in mind that they have shown their true colors to the rest of the world. There will be no forgiveness if their bias hinders or undermines the fight against the virus.
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【简答题】如图所示的四个图形中，图形（1）与图形______成轴对称；图形（1）与图形______成中心对称．（填写符合要求的图形所对应的符号）
【简答题】脂肪酸的β-氧化与生物合成的主要区别是什么?
【单选题】We call a ship equipped with a diesel engine as main engine____.
A.
a tug boat
B.
a salvage ship
C.
an oil tanker
D.
a motor vessel
【单选题】The thickness of the oil film to be developed in a diesel engine main bearing, depends upon the_____.
A.
bearing pressure
B.
viscosity of oil
C.
rpm of the shaft
D.
all of the above
【简答题】试确定图示截面的形心位置。2.求图示截面中阴影部分对z轴的静矩。3.求图示截面对z轴的惯性矩。
【简答题】液相色谱-质谱联用大都采用大气压电离源作为接口装置和离子源。包括____电离源和____电离源,其中以____电离源应用最为广泛。
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