空气干燥煤样,是指煤样在空气中连续干燥1h,其质量变化()。
A.不大于1%
B.不大于2%
C.不大于0.5%
D.不大于0.1%
参考答案:D
It is generally considered unwise to give a child _____ he or she wants.[ ]
A. whatever
B. however
C. whichever
D. whenever
机动车仪表板上(如图所示)这个符号表示什么?()
A.冷风暖气风扇
B.空调制冷
C.空气循环
D.雪地起步模式