单项选择题
测量超声波传过混凝土介质所需的时间一般以( )计。A.sB.msC.μsD.min
单项选择题测量超声波传过混凝土介质所需的时间一般以( )计。
What's the output of the following code? A、3 B、9 C、 D、
单项选择题What's the output of the following code? A、3 B、9 C、 D、
75. Children often become surrogate mothers to abandone...
单项选择题75. Children often become surrogate mothers to abandoned animals. A、substitute B、temporal C、affectionate D、step