Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that
A. low loading of that cylinder
B. faulty combustion in that cylinder
C. sluggish piston ring action
D. excessive piston cooling
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有头皮屑并不影响头发的生长,头发也不会()。
A. 产生损伤
B. 产生干枯
C. 产生发梢发叉
D. 产生早白
不需立即更换口罩的情况是()。
A. 口罩潮湿时
B. 接触霍乱病人后
C. 污染的手接触了口罩
D. 为冠心病病人测血压后
E. 隔离衣袖口触及口罩
The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with
A. shut
B. closing
C. opened
D. closed
将新鲜的石灰石浆液由氧化区补充入吸收塔会(),从而降低脱硫效率。
A. 降低氧化区的ph值;
B. 降低氧化速度;
C. 提高石灰石利用率;
D. 提高副产品石膏的品质。