桂花一般适用压条繁殖中的()方法繁殖。
A水平压条
B空中压条
C普通压条
D堆土压条
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影响扦插成活的因素内因:()、()、(枝条部位和发育状况)、()。
The teaching method should be varied at different stages of learning______achieving better
A. in order to
B. as a result of
C. with a view to
D. in relation to
选择建立苗圃地时,土壤质地以()为好。
A壤土、沙壤土、轻壤土
B黏土
C沙土
D盐碱土