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【单选题】
梯形螺纹粗车刀的刀尖角应取()A.
0 °
B.
10-15 °
C.
30 °
D.
29 ° 30 ′
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】Before Sept. 11, the U.S. Congress had been unable to pass stricter immigration laws because.
A.
they might have kept away foreign students and cheap labor
B.
it was difficult to coordinate the efforts of the congressmen
C.
education and business circles cared little about national security
D.
resources were not available for their enforcement
【简答题】电荷的 形成电流,形成持续电流的条件是 和 。
【单选题】The mining industry in the U.S. became safer after the late 1960s because
A.
the U.S. Senate passed laws requiring federal mine inspections.
B.
the U.S. Congress passed laws requiring federal mine inspections.
C.
the U.S. health and safety officials passed laws requiring federal mine inspections.
D.
the U.S, mine companies passed laws requiring federal mine inspections.
【单选题】Before Sept.11, the U.S. Congress had been unable to pass stricter immigration laws because ________.
A.
education and business circles cared little about national security
B.
resources were not available for their enforcement
C.
it was difficult to coordinate the efforts of the congressmen
D.
they might have kept away foreign students and cheap labor
【单选题】In 1642 and 1647, the Bay Colony passed laws requiring all parents to provide _____ education for their children.
A.
writing
B.
speaking
C.
reading
D.
listening
【单选题】Why are there laws made against smoking in public places in the U.S.?
A.
Because people have realized the danger of second-hand smoke.
B.
Because more and more people don't like smoking now.
C.
Because parents don't want their children to become smokers.
D.
Because the government wants to limit the production of cigarettes.
【单选题】Before Sept 11, the U.S. Congress had been unable to pass stricter immigration laws be- cause______.
A.
they might have kept away foreign students and cheap labor.
B.
it was difficult to coordinate the efforts of the congressmen.
C.
education and business circles cared little about nation.
D.
resources were not available for their enforcement.
【单选题】Laws requiring computer companies to pay for recycling their products have been passed for the purpose of ( )
A.
urging them to design upgradeable equipment
B.
cutting down their costs of production
C.
reducing the number of computers to be produced
D.
encouraging them to advertise their products
【单选题】Game laws in every state of the U.S. regulate the raising of wild game.
A.
Y
B.
N
C.
NG
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