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【判断题】
远动系统中每个设备的可靠性一般用平均故障间隔时间来表示。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】The parents are very _____ their child.
A.
ashamed of
B.
proud of
C.
sorry for
D.
worried about
【单选题】The parents are very happy _____ with their children.
A.
play
B.
to play
C.
playing
D.
played
【简答题】动机:动机是指个体通过艰苦努力实现_____的愿望,而这种努力又能满足____的某种需要。
【简答题】园路一般有三种类型路堑型、（）和特殊型。
【单选题】The parents are very ________ for their children.
A.
aggressive
B.
ambitious
C.
indifferent
【简答题】园路一般有三种类型 、 和 。
【单选题】The parents are very happy_______with their children.
A.
to play
B.
play
C.
playing
D.
played
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