往天然气系统喷注的乙二醇浓度应为()。
A.60%
B.70%
C.80%
D.90%
参考答案:C
He intends to apply for _______ permit from the government to export goods of ______ high quality to Russia.
A./; a
B.a; /
C./; /
D.a; the
要设计出带表格线的报表,完成表格线的显示需要向报表中添加______控件。
A.复选框
B.标签
C.文本框
D.直线或矩形