【单选题】下面哪一项是关于宏观经济学的错误认识?()
【单选题】Jenny pushed the door again to ______ it ______.
A.
make sure if; was closed
B.
make sure that; was locked
C.
found out it; was shut
D.
find out that; was open
【单选题】When leaving the lab ,____________ the door is locked . A. B. be sure to C. make sure that D. make sure of
【简答题】已知,则的值为 .已知 ,则 的值为____.
【简答题】Make sure the battery is fixed firmly into place.
【简答题】已知 ,则 的大小为( );已知 ,则 的大小为( )