工业筛筛孔数目即目数习惯上指( )
A. 每厘米长度上筛孔数目
B. 每平方米面积上筛孔数目
C. 每英寸长度上筛孔的数目
D. 每平方英寸面积上筛孔数目
需要水飞法粉碎的药物是( )
A. 冰片
B. 水杨酸
C. 麦冬
D. 朱砂
College education provides more __ for a bright future.
A. lessons
B. courses
C. opportunities
D. subjects
He had a __ to his wife who gave him the money to start his business.
A. job
B. debt
C. chance
D. career