Physics ______ much harder than English, I think. [ ]
A. are
B. is
C. was
D. were
答案:B
若在巡视中发现SF6设备有异常情况,应如何应对?
疏松结缔组织中能合成纤维和基质的细胞是();脱颗粒能引起过敏反应的细胞是();核偏向一侧,染色质沿核膜呈车轮状排列的细胞是()。