There ______________ a pen and two books on the desk. [ ]
A. is
B. are
C. was
D. were
答案:A
以下经济特区不属于广东省的是[ ]
A.珠海
B.深圳
C.汕头
D.厦门
可调托撑支托板厚不应小于()mm,变形不应大于1mm。
A.4
B.5
C.3.5