圆水准器一般安置在照准部上,水准管安置在基座上,前者一般用于粗平,后者一般用于精平。( )
参考答案:错
The ________of service in this restaurant has improved a lot since I last had a dinner with my friends
there.[ ]
A.method
B.attitude
C.quality
D.cost
在E-R图中,用来表示实体的图形是______。
A.矩形
B.椭圆形
C.菱形
D.三角形