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问题
单项选择题
水情信息具有（）、相对性、共享性、传递性、可压缩性等本质属性特征。
A、时效性
B、延时性
C、落后性
D、超前性
答案
参考答案：A
判断题
判断对(√)错(×)。
( ) 1.
The pencil is long.
( ) 2.
The tree on the left is short.
( ) 3.
The apple is in the house.
( ) 4.
The pencil is under the book.
( ) 5.
It has two long ears.
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问答题 简答题
制动器有哪些电气故障会造成重物坠落事故？
查看答案
The pencil is long.
The tree on the left is short.
The apple is in the house. 
The pencil is under the book.
It has two long ears.