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【单选题】
下列说法中正确的是A.
离子化合物的熔点一定比共价化合物的高
B.
稀有气体形成的晶体属于分子晶体
C.
干冰升华时,分子内共价键会发生断裂
D.
原子晶体的熔点一定比金属晶体高
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【多选题】Which of the following statements are true about customs clearance_____?
A.
import cargo can be landed at any port
B.
the customs authorities only inspect the goods imported physically
C.
the customs authorities have powers to examine the goods imported
D.
before permission is given to remove the goods out of customs control, the owner or agent is required to submit a bill of entry
【简答题】The UN should ﹍﹍ theestablishment of Iraqi government after the war, I think. A. takepart in B. playa leading role in C. playa role among D. playa important part for
【单选题】放射免疫分析法的基本原理是
A.
标记抗原与非标记抗原同时与过量抗体进行竞争性免疫结合
B.
标记抗体与非标记抗体同时与限量抗原进行竞争性免疫结合
C.
标记抗原与非标记抗原同时与限量抗体进行非竞争免疫结合
D.
标记抗体与非标记抗体同时与过量抗原进行竞争性免疫结合
E.
标记抗原与非标记抗原同时与限量抗体进行竞争性免疫结合
【单选题】Governmen t corruption
A.
impede s th e coordinatin g powe r o f market s an d discourage s investment.
B.
impede s th e coordinatin g powe r o f market s bu t doe s no t discourag e investment.
C.
doe s no t imped e th e coordinatin g powe r o f markets , bu t doe s discourag e investment.
D.
ca n neithe r imped e th e coordinatin g powe r o f market s no r discourag e investment.
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