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【单选题】
科学家把天竺葵的原生质体和香茅草的原生质体进行诱导融合,培育出的驱蚊草含有香茅醛,能散发出一种特殊的气味达到驱蚊且对人体无害的效果。下列关于驱蚊草培育的叙述中,错误的是( ) A .驱蚊草的培育属于细胞工程育种,其优点是能克服远缘杂交不亲和的障碍 B .驱蚊草的培育过程要用到纤维素酶、果胶酶、 PEG 试剂或离心、振动、电刺激等方法 C .驱蚊草的培育过程是植物体细胞杂交,不同于植物组织培养,无愈伤组织和试管苗形成 D .驱蚊草不能通过天竺葵和香茅草杂交而获得,是因为不同物种间存在生殖隔离
A.
B.
C.
D.
D
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【单选题】下列所述与第一次鸦片战争的爆发没有关系的一项是( )。
A.
虎门销烟
B.
第一次工业革命
C.
英国在中英两国的贸易中处于贸易逆差的地位
D.
清朝政府的腐败无能
【单选题】急性额窦炎头痛
A.
晨轻午后重
B.
晨重午后轻
C.
中午最剧
D.
晚上最剧
E.
无明显时间规律
【简答题】DATE AND METHOD OF SHIPMENT:20 June,2007-30 June,2007 by sea; otherwise 1 July,2007-15 July,2007 on seller's account by air. (1) 翻译: (2) 该合同下的货能否在18 June,2007或18 July,2007装运,为什么?
【单选题】19 At 30 June 2004 a company’s allowance for receivables was $39,000. At 30 June 2005 trade receivables totalled $517,000. It was decided to write off debts totalling $37,000 and to adjust the allowan...
A.
$61,000
B.
$22,000
C.
$24,000
D.
$23,850
【单选题】不均匀系数Cu的计算公式为()
A.
Cu=d60/d10
B.
Cu=d10/d60
C.
Cu=d30/d10
D.
Cu=d10/d30
【简答题】1四肢靠近躯干的部位为 。
【单选题】What departure date is valid for the special?
A.
June 1
B.
June 30
C.
July 1
D.
July 30
【简答题】A.May 30th. B.June 30th. C.July 30th. D.August 30th.
【单选题】On June 1st, Lucy & Bros received an order for 500 cupcakes. Lucy delivered the cupcakes to the client on June 25th. A $50 deposit was received on June 5th and the remaining $450 was paid on June 30th...
A.
June 1st
B.
June 5th
C.
June 25th
D.
June 30th
【单选题】The phrase "the L/C is to be valid till June 30" doesn't mean _______.
A.
the L/C should be opened on June 30
B.
the L/C is good until June 30
C.
the L/C expires after June 30
D.
the L/C remains open till June 30
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