题目内容

What happened on the second day of Craig's stay in New York City？

A. an earthquake
B. a foreign invasion
C. two airplanes crashing into the Twin Towers
D. the collapse of many skyscrapers

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灌砂法适用于现场测定细粒土、砂类土和砾类土的密度。试样的最大粒径不得超过15mm，测定密度层的厚度为150～200mm。()

A. 正确
B. 错误

Closing prices for a certain stock were recorded each day for a week in the table above. If the monthly average (arithmetic mean) was 18.43 and the standard deviation was 0.27, how many days during this week did the closing price fall within two standard deviations from the average？

A. 1
B. 2
C. 3
D. 4
E. 5

偶尔可引起慢性子宫内翻的是

预收账款是企业向购货单位预收的款项,其与应付账款不同,预收账款所形成的负债不是以货币偿付,而是以货物偿付。()

A. 正确
B. 错误