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【判断题】
大气压力是指大气层中空气柱的质量对地面物体单位面积上的作用力。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Ulrich suspected somebody had intruded into the woodland because
A.
some animals made some unusual movement.
B.
he was informed of the intrusion in advance.
C.
his foresters detected the trace of the intruder.
D.
there was suffocating quietness in the air.
参考解析：
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