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【单选题】
查询订购单号首字符是“P”的订单信息，应该使用命令A.
SELECT * FROM 订单 WHERE HEAD（订购单号，1）=“P”
B.
SELECT * FROM 订单 WHERE LEFT（订购单号,1）= “P”
C.
SELECT * FROM 订单 WHERE “P”$订购单号
D.
SELECT * FROM 订单 WHERE RIGHT（订购单号,1）= “P”
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反馈参考答案：
举一反三
【单选题】As the name implies, connecting rods are used to connect pistons to the ( ).
A.
crankshaft.
B.
camshaft
C.
drive shaft
D.
none of above
【单选题】[7-29]___indicates that the vertical deflection of a ship’s hull,in longitudinal direction,where the hull midships is bent upwards.
A.
Shearing
B.
Sagging
C.
Hogging
D.
Buckling
【简答题】As the name implies, wastewater is mostly water. A very _______ is waste material.
【简答题】食品安全性毒理试验的检验程序有四个阶段: 、 、 和 。
【单选题】RE resources, as the name implies, are constantly replenished naturally and will never be exhausted.
A.
refilled
B.
replicated
C.
replaced
D.
replayed
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