某厂精炼用的硅钙线100米，其中硅钙粉重400g，铁皮重为150g，计算其单重是多少？
《中华人民共和国民用航空法》第五条规定，下面哪个属于民用航空器（）
A. 空军的战机
B. 海关直升机
C. 民航客机
D. 警察直升机
Worn out ring grooves should be （） to standard dimension after being welded.
A. machined
B. bored
C. honed
D. drilled
What is the advantage of setting the ASM-preferred mirror read for the Stretch cluster configuration?（）
A. It improves resync operations.
B. This feature enables much faster file opens.
C. It improves performance as fewer extent pointers are needed in the shared pool.
D. It improves performance by reading from a copy of an extent closest to the node.
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