以背书的目的为标准，背书可分为（）。
A.委托收款背书
B.质押背书
C.转让背书
D.非转让背书
参考答案：C, D
—Did you enjoy yourself during the holiday?
—Yes, we had ______ in Beijing.[ ]
A. a quite good time
B. quite a good time
C. very a good time
D. very good time
空气洁净度静态测试时，室内测试人员不得多于（）人。
A、1
B、2
C、3
D、4
