苗木繁殖的方式主要有()、()、()等。
参考答案:无性繁殖、有性繁殖、组织培养
下列溃疡中愈合后会留下瘢痕的是()。
A.轻型阿弗他溃疡
B.重型阿弗他溃疡
C.疱疹样阿弗他溃疡
D.白塞病口腔溃疡
E.以上均会
The main purpose of the Customs supervision and control is to () China’s economic, trade, scientifrc, technological and cultural exchanges with other countries.
A. supervise
B. control
C. promote
D. limit