更多"[单选题]A large proportion of importan"的相关试题:
[单选题]C6H6 +3Br2→ C6H5Br6属于单环芳烃的（）。
A.A.卤代反应
B.B.烷基化反应
C.C.磺化反应
D.D.加成反应
[单选题]在 CH3COCH3 + Br2→CH3COCH2Br + HBr的反应中最常用的催化剂是（）。
A.A.HAc
B.B.KOH
C.C.A12(SO4)3
D.D.FeCl3
[判断题]《格拉段旅客列车运输加价》规定：
硬卧每人/千米核收1.0元
软卧每人/千米核收1.6元
硬座不核收0.1元
A.正确
B.错误
[单选题]What is the most important breakthrough that the film The Shaivshank Redemption has achieved?
A.The harmonious union of art.
B.Its music.
C.The most abstract concepts.
D.Its thematic material.
[单选题]Why is allowance important for children?
A.They can get first direct contact with the real financial world.
B.They can learn to make money with their own ideas and efforts.
C.They can have their own plan for the present and the future.
D.They can learn how to deal with money without too much risk.
[判断题]用溴单质氧化硫酸亚铁所组成的电池应记为Pt|FeSO4，Fe3（S04）2‖Br-|Br2,Pt。
A.正确
B.错误
[判断题]用溴单质氧化硫酸亚铁所组成的电池应记为Pt|FeSO4，Fe3(S04)2||Br-|Br2,Pt。
A.正确
B.错误
[单选题]溴酸钾法测定苯酚的反应是如下：BrO3-+5Br- +6H+==3Br2+3H20, C6H50H+3Br2==C6H2Br20H+3HBr,Br2+2I-==I2+2Br-, I2+2S2032- ==S4O62-+2I- 在此测定中，Na2S203与苯酚的物质的量之比为()。
A.A.6:l
B.B.3:1
C.C.2:1
D.D.1:1
[单选题]Self-esteem is important because_.
A.it can reduce our anxiety about life and death
B.it affects how we are treated in a community
C.it is very fragile and easily lost
D.it influences the understanding of ourselves and our relations with others
[单选题]Which of the following is the most important for success?
A.Concentrate on what you are doing.
B.Aim for the highest.
C.Start with the subordinate positions.
D.Invest carefully.
[单选题] It is important to start hobbies early because _ .
A.you must choose a seed and then tend it carefully before getting fruits
B.the cultivation of a hobby takes time
C.there is no connection between hobbies and work
D.a hobby is of first importance to a public man
[单选题] Shipment is an important part in the international business when goods are transported ____ ,Bill of Lading is involved.
A. by air
B. by sea
C. on rail
D. on road
[判断题]《修规》第3.6.3条
①总磨耗=垂直磨耗+1/2侧面磨耗。
②垂直磨耗在钢轨顶面宽1/3处(距标准工作边)测量。
③侧面磨耗在钢轨踏面(按标准断面)下16mm处测量。
A.正确
B.错误
[判断题] We are a large company especializing in the import and export of steel products.
A.正确
B.错误
