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【单选题】
当 n < 30 时,用样本均数估计总体均数的 95% 可信区间的公式为 DA.
` x ± 1.96 S
B.
` x ± t0.05 ， v S ` x
C.
` x ± 1.96 S ` x
D.
` x ± t0.05 ， v S ` x
E.
` x ± 2.58S
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【简答题】毕奥--萨伐尔定律给出了_____________(电流元或电流)激发磁场遵守的规律。
【单选题】Please ____ by telex the shipment date of your L/C to December 3rd, 2005, thus enabling us to effect shipment of the goods in question.
A.
prolong
B.
lengthen
C.
expand
D.
extend
【单选题】Please ____ to effect your delivery as soon as possible.
A.
make the best
B.
do the best
C.
do your best
D.
make your best
【简答题】Owing to the delayed arrival of the steamer, we have failed to effect shipment within the L/C validity. Would you please extend the shipment of the L/C for one month enabling us to make shipment as qu...
【单选题】Request a business partner to effect payment.
A.
Would you please pay this amount as soon as you can at Bank of China, Liaoning?
B.
We ask you to pay the billed amount to us as soon as possible.
【简答题】在某市场，甲乙丙分别占据着40%、30%、9%，的份额，其他经营者的都不足1%，那么，关于甲乙丙市场支配地位的表述正确的是（ ）。
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