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【单选题】
"First aid is...open to human error" in the second paragraph means （）.A.
there are never failures in first aid
B.
medical care in first aid is essential
C.
human mistakes are possible in first aid
D.
first aid is widely applied to accidents
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举一反三
【单选题】Reduced capacity, accompanied by vibration and noise at the suction of a centrifugal pump is a result of _____.
A.
cavitation
B.
water hammer
C.
fluid friction
D.
steam knock
【简答题】简述数字水印的四种攻击方法。
【单选题】Reduced capacity accompanied by vibration and noise at the suction of a centrifugal pump is a result of ____.
A.
cavitation
B.
Water hammer
C.
Fluid friction
D.
Steam knock
【简答题】日本の製品 日本の製品といえば、やはり電気製品です。品質が良くて故障が少ないので、とても評判がいいです。いくら小さい物を買っても、その製品に詳しい説明書や保証書が付いています。
しかし欠点もあります。 それは必要のない機能が付きすぎていることと、 モデルチェンジが早すぎることです。 注釈: 品質(ひんしつ) 「名」 质量 評判(ひょうばん) 「名」
评价、评论、名声 詳しい(...
【单选题】Vibration of No.2 fuel booster增压 pump may prick up 加剧. 02010271
A.
Vibration of No.1 fuel oil booster pump may strengthen.
B.
Vibration of No.2 fuel oil circulation pump may strengthen.
C.
Vibration of No.2 fuel oil booster pump may strengthen.
D.
Vibration of No.1 fuel oil circulation pump may strengthen.
【单选题】The vibration pump provides the hydraulic drive for vibration motor on the lefthand of the drum, which generates the vibration by _______ the eccentric shaft.
A.
rotating
B.
reciprocating
C.
rotated
D.
reciprocated
【单选题】Reduced capacity accompanied by vibration and noise at the suction of a centrifuga pump results from the Action of vapor pockets in the water being pumped caused by__
A.
fluid friction
B.
pump knocking
C.
cavitation
D.
water hammer
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