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问题 单项选择题

The goods must be ( ) in p wooden cases.

A．packing
B．packed
C．shipped
D．shiooing

答案

参考答案：B

选择题

The machine is easy to _______if you follow the instructions.

A．be operated

B．operate

C．be operated on

D．operate on
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单项选择题

红细胞目视计数法的计算公式应是(N表示5个中方格内红细胞数)( )

A．N×5×10×103×200
B．N×25×10×104×200
C．N×5/25×10×105×200
D．N×25/5×10×106×200
E．N×25/5×10×109×200
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