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【简答题】
There are four seasons in a year. Spring is from March to May, summer is from June to August; autumn is from September to November, winter is from December to February. However in Canada, the time of the seasons are completely different. In Canada, spring is from September to November, summer is from December to February; autumn is from March to May, winter is from June to August. So when we are making a snowman, the Canadians are eating ice cream. And the Christmas activities in Canada are different, too. They usually go swimming and wear less clothes. Can other countries do the same? No! Because they are in winter. ( ) 1. There are there seasons in a year. ( ) 2. In China, summer is from June to August. ( ) 3. In Canada, winter is from December to February. ( ) 4. Canadians usually make a snowman in Christmas. ( ) 5. The time of the seasons are different between China and Canada.
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【单选题】杨氏双缝干涉实验中,两缝间距为0.3mm,用单色光垂直照射双缝,在离缝1.2m的屏上测得中央明纹一侧第5条暗纹与另一侧第5条暗纹之间的距离为22.78mm,则入射光波长为。
A.
569.5nm
B.
632.8nm
C.
711.9nm
D.
589.3nm
【单选题】空气中(n=1.0),杨氏双缝干涉实验中,两缝间距为0.3mm,用单色光垂直照射双缝,在离缝1.2m的屏上测得中央明纹一侧第5条暗纹与另一侧第5条暗纹之间的距离为22.78mm,则入射光波长为。
A.
632.8nm
B.
569.5nm
C.
711.9nm
D.
589.3nm
【简答题】在软土或其他不稳定土层中采用横排撑板支撑时,开始支撑的沟槽开挖深度不得超过1.0m。
【单选题】在软土或其他不稳定土层中采用撑板支撑时,开始支撑的开挖沟槽深度不得超进( ) m ;以后开挖与支撑交替进行,每次交替的深度宜为( )m。
A.
1.5 ,0.4~0.8
B.
1.5, 0.5~0.8
C.
1.0 ,0.4~0.8
D.
1.0,0.5~0.8
【单选题】在软土或其他不稳定土层中采用横排撑板支撑时,开始支撑的沟槽开挖深度不得超过( );开挖与支撑交替进行,每次交替的深度宜为0.4~0.8m。
A.
2.0m
B.
3.0m
C.
4.0m
D.
1.0m
【单选题】为证明航行值班的构成足以保证能连续保持正规的了望,船长应考虑的因素包括:() Ⅰ、能见度,天气和海况 Ⅱ、船舶尺度和指挥位置的视野 Ⅲ、驾驶台仪器和控制器,包括报警系统的工作状况
A.
Ⅰ、Ⅱ
B.
Ⅰ、Ⅱ、Ⅲ
C.
Ⅰ、Ⅲ
D.
Ⅱ、Ⅲ
【单选题】为证明航行值班的构成足以保证能连续保持正规的瞭望,船长应考虑的因素包括__。1能见度、天气和海况;2船舶尺度和指挥位置的视野;3驾驶台仪器和控制器,包括报警系统的工作状况。
A.
①②
B.
①②③
C.
①③
D.
②③
【判断题】在软土和其他不稳定土层中采用撑板支撑时,开始支撑的沟槽开挖深度不得超过2米
A.
正确
B.
错误
【多选题】与间接融资相比,直接融资的局限性体现为
A.
资金供给者的风险较大
B.
降低了投资者对筹资者的约束与压力
C.
在资金数量、期限等方面受到较多限制
D.
资金供给者获得的收益较低
E.
资金需求者的风险较大
【判断题】乙级工程招标代理机构只能承担工程总投资额6000万元人民币以下的工程招标代理业务
A.
正确
B.
错误
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