Visitors to the United States possible feel that city people of the country are very ()
A. busy
B. kind
C. troubling
D. patient
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The "departure date" on the small white form gives the date ______.
A. to which you can extend your stay
B. on which you apply for a longer stay
C. on which you arrive in the country
D. by which you must leave the country
矿井风量按井下同时工作的最多人数计算,每人海分钟供风量不少于( )。
A. 1m3
B. 2m3
C. 3m3
D. 4m3
A tourist who visits the USA will most probably get a visa of ______.
A. F1
B. F2
C. B1
D. B2
为了减轻火花放电和感应带电的危险,可采用阻值为( )n左右的导电性工具。
A. 106~107
B. 107~108
C. 108~109
D. 107~109