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【单选题】
在同一小接地电流系统中,所有出线均装设两相不完全星形接线的电流保护,电流互感器都装在同名两,这样发生不同线路两点接地短路时,可保证只切除一条线路的几率为( )A.
1/3;
B.
二分之一
C.
2/3
D.
1
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】支气管扩张患者大咯血时,最关键的抢救措施在于
【单选题】患儿男, 5岁。测口温时不慎将体温计咬碎,护士应立即
A.
让患者口服牛奶 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
B.
催吐
C.
让患者服缓泻剂
D.
清除患者口腔内玻璃碎屑
E.
为患者洗胃
【多选题】Which two are true about aggregate functions?（）
A.
You can use aggregate functions in any clause of a SELECT statement.
B.
You can use aggregate functions only in the column list of the select clause and in the WHERE clause of a SELECT statement.
C.
You can mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.
D.
You can pass column names, expressions, constants, or functions as parameter to an aggregate function.
E.
You can use aggregate functions on a table, only by grouping the whole table as one single group.
F.
You cannot group the rows of a table by more than one column while using aggregate functions.
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