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【多选题】
关于组织培养，描述正确的有（）A.
繁殖系数较低，切面较大，易感染病毒病等病害
B.
主要用于大量生产无病毒商品花卉，尤其是观叶植物和鲜切花
C.
繁殖速度快，繁殖系数大，繁殖，适用的品种多
D.
其寿命的长短除与遗传特性和发育是否健壮有，还受环境因素的影响
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皮皮学刷刷变学霸
举一反三
【单选题】The business is said to be _____ of a director .
A.
under the control
B.
under control
C.
in the control
D.
in its control
【单选题】The director of the language training department said that they needed to keep making an effort to tailor their programs __________ the needs of the individual.
A.
to
B.
for
C.
by
D.
about
【简答题】孕妇对能量和营养素的消化及代谢有哪些生理特点，对能量和营养素又有哪些营养需要？
【单选题】恶性度高的胃癌可能发生跳跃式淋巴结转移而直接侵犯远处淋巴结，其中最常见的是（）
A.
腹腔淋巴结
B.
肝总动脉旁淋巴结
C.
脾门淋巴结
D.
结肠中动脉旁淋巴结
E.
左锁骨上淋巴结
【单选题】Which director is giving the opening speech at th~ Annual General Meeting?
A.
Sales
B.
Personnel
C.
Finance
【单选题】The Managing Director said that improving relations with the association would not be easy, but that they ______to try.
A.
would have decided
B.
decide
C.
have decided
D.
had decided
【单选题】“Our brand is selling just like hot cakes,” said the director with a ______ expression on his face.
A.
satisfying
B.
satisfaction
C.
satisfied
D.
satisfactory
【单选题】WHO Western Pacific Regional Director Shigeru Omi said that a bird flu pandemic had killed a lot of Asian people.
A.
Y
B.
N
C.
NG
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