题目内容

______receipt of your instructions we will send the goods.

A. In
B. Having
C. Upon
D. After

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_______the market price is falling, we recommend your immediate acceptance

A. When
B. If
C. As
D. In

In case you can reduce the minimum to 5000 yards per design, there is a possibility of _______orders.

A. reaching
B. placing
C. doing
D. making

Please refer the chart enclosed.

A. to
B. with
C. for
D. on

某量观测值中误差与相应观测值的比值叫作（）。

A. 中误差
B. 绝对误差
C. 相对误差
D. 极限误差