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劳动者在什么情况下要承担违约责任？

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将二进制数10010101转换为十进制数，正确的是（）。

A. 148
B. 269
C. 267
D. 147

Excessive alkalinity of the water in an auxiliary boiler can cause （）.

A. caustic embrittlement of the boiler metal
B. acidic corrosion of the boiler metal
C. hard scale deposits on the boiler tubes
D. etching of the heat exchange surface

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Which of the following statements concerning cylinder liner wear is true?（）

A. Liner wear is distributed equally between the upper and lower portions of the cylinder
B. Excessive liner wear causes wear between piston ring and groove
C. Excessive, but uniform liner wear will not cause wear between piston ring and groove
D. Liner wear is normally greatest in the middle of the cylinder

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下哪项不属于全球社会面临的“灰色地带”的威胁（）。

A. 恐怖主义
B. 人口增多
C. 环境恶化
D. 毒品走私

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