结构试验前,对所使用的仪器进行标定的原因为( )。
A.测定仪器的分辨率 B.测定仪器的灵敏度和精确度 C.测定仪器的最小分度值 D.测定仪器的量程
参考答案:B
Please tell me ________. I have some gifts for him. [ ]
A. how has Robert come
B. where Robert is
C. when will Robert leave
D. what does Robert like
在具翅胸节的背板上存在哪些沟?()
A.前脊沟
B.前盾沟
C.盾间沟
D.侧沟