晶面指数（111）与晶向指数（111）的关系是（）。
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根据国际收入平衡表的记帐原则，属于贷方项目的是（）。
A. 进口劳务
B. 本国居民获得外国资产
C. 官方储备增加
D. 非居民偿还本国居民债务
各部机械润滑要好，注稀油机件不超过（）℃。
A. 60
B. 70
C. 80
D. 90
What are two rules for compacting IPv6 addresses？（）
A. The maximum number of times a double colon can replace a 16-bit segment that consists of all zeroes is two
B. The leading zeroes in any 16-bit segment do not have to be written.
C. Every 16-bit segment that consists of all zeroes can be represented with a single colon
D. The trailing zeroes in any 16-bit segment do not have to be written.
E. Any single， continuous string of one or more 16-bit segments that consists of all zeroes can be represented with a double colon
F. Two zeroes in the middle of any 16-bit segment do not have to be writte
出现柏油便时，上消化道出血至少达多少毫升以上（）。
A. 5
B. 20
C. 30
D. 50
E. 100
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