Which statement about pneumatic chipping tools is TRUE ________．A.The operator must wear safety goggles or glassesB.The equipment must be grounded to prevent shock hazardC.The chipping mechanism is made of a non-sparking material that is safe to use near explosive atmospheresD.The needles of the needle-type chipping gun must be replaced when they have been blunted more than 1/2 of their diameter
Which statement about pneumatic chipping tools is TRUE ________．
A.The operator must wear safety goggles or glasses
B.The equipment must be grounded to prevent shock hazard
C.The chipping mechanism is made of a non-sparking material that is safe to use near explosive atmospheres
D.The needles of the needle-type chipping gun must be replaced when they have been blunted more than 1/2 of their diameter
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多选题Which three statements about subqueries are true? （）AAsinglerowsubquerycanretrieveonlyonecolumnandonerow.BAsinglerowsubquerycanretrieveonlyonerowbutmanycolumns.CAmultiplerowsubquerycanretrievemultiplerowsandmultiplecolumns.DAmultiplerowsubquerycanbecomparedusingthe；；；operator.EAsinglerowsubquerycanusetheINoperator.FAmultiplerowsubquerycanusethe；=；operator.
单选题Which statement is true regarding the INTERSECT operator?（）AIt ignores NULL values BReversing the order of the intersected tables alters the result CThe names of columns in all SELECT statements must be identical DThe number of columns and data types must be identical for all SELECT statements in the query
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