叶脉是叶片的“________”,有________作用,其内还有_______

题型:填空题

问题:

叶脉是叶片的“________”,有________作用,其内还有________和________(输送有机养料),因此,叶脉还有________作用。

考点:叶片的结构
题型:填空题

《职业病目录》中规定职业中毒有56种,被列为职业中毒的有()。

A.一氧化碳中毒 

B.硫化氢中毒 

C.铝中毒 

D.汞及其化合物中毒

题型:填空题



China is to send its top negotiator on North Korea’s nuclear program to Pyongyang (36) amid international concern over the launch of (37) .
While the (38) and its ally Japan push for (39) against North Korea, China is (40) , not sanctions.
Also, the (41) to Japan says sanctions on North Korea will (42) efforts to bring the secluded state back to (43) on its nuclear program.
North Korea (44) the six-party talks in (45) after Washington imposed financial sanctions for alleged counterfeiting and (46) activities.
A broadcast on North Korean State Television (47) the missile tests, in what it called a "successful (48) ".
It said North Korea will take action against anyone who (49) them.
The Minister is reported to have told a (50) that the missile launches were (51) because of America’s sanctions against Pyongyang.
North Korea remains (52) in the face of international condemnation and has warned (53) could be carried out.
UN Security Council members will (54) discussions tonight on whether a (55) condemning the missile launches should call for sanctions.

题型:填空题

美沙酮的化学结构中不含有哪个基团

A.酚羟基
B.酮基
C.二甲氨基
D.甲基
E.苯基

题型:填空题

医学伦理学的公正原则,是指

A.不同病人给予不同对待

B.不同的经济给予不同对待

C.不同的需要给予同样的对待

D.同样需要的人给予同样的对待

E.不同的病情给予同样的对待

题型:填空题

压力容器安全状况等级分为1-5级,当为1级时压力容器应判废。

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