Which statement concerning GPS is TRUE ________．A.It cannot be used in all parts of the worldB.There are 12 functioning GPS satellites at presentC.It may be suspended without warningD.Two position lines are used to give a 2D fix
Which statement concerning GPS is TRUE ________．
A.It cannot be used in all parts of the world
B.There are 12 functioning GPS satellites at present
C.It may be suspended without warning
D.Two position lines are used to give a 2D fix
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单选题Which statement is true regarding subqueries?（）AThe LIKE operator cannot be used with single-row subqueries BThe NOT IN operator is equivalent to IS NULL with single-row subqueries C=ANY and =ALL operators have the same functionality in multiple-row subqueries DThe NOT operator can be used with IN, ANY, and ALL operators in multiple-row subqueries
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