标准化是一项综合性很强的基础工作,是国家的一项重要( )。
A.技术经济政策
B.法律政策
C.信息管理政策
D.企业管理政策
参考答案:A
It is _______ he often fails in exam_______ makes his parents worried about him. [ ]
A. because, that
B. that, that
C. 不填, that
D. what, that
圆环形卡环通常包绕基牙的()
A.3个面和4个轴角
B.3个面和3个轴角
C.3个面和2个轴角
D.2个面和3个轴角
E.2个面和2个轴角