辅助T细胞的功能是分泌细胞因子,激活天然杀伤细胞,直接造成目标细胞死亡。

题型:判断题

问题:

辅助T细胞的功能是分泌细胞因子,激活天然杀伤细胞,直接造成目标细胞死亡。

考点:生物学微生物学绪论微生物学绪论题库
题型:判断题

下述叙述不正确的是()。

A.睡眠呼吸暂停综合征分为中枢型、阻塞型和混合型

B.睡眠呼吸暂停综合征常见的临床表现有嗜睡、头晕乏力、行为异常等

C.睡眠呼吸暂停综合征指每晚7小时睡眠中,呼吸暂停反复发作30次以上或睡眠紊乱指数≥5

D.睡眠紊乱指数指平均每小时睡眠呼吸暂停次数加上低通气次数

E.睡眠呼吸暂停综合征指每晚7小时睡眠中,呼吸暂停反复发作20次以上或睡眠紊乱指数≥5

题型:判断题

2015年9月4日,央视制作并播放的《开学第一课》以“英雄不朽”为核心主题。英雄,激发的是向上的力量,指引的是人生的航向。认同英雄,就是认同正确的价值观;追随英雄,就是追随真善美;颂扬英雄,就是颂扬正能量。认同、追随和颂扬英雄是()。

①社会主义精神文明建设根本任务

②提高全民族综合素质的必然要求

③提升我国国际竞争力的关键因素

④弘扬中 * * 精神的具体体现

A、①②

B、①③

C、②④

D、③④

题型:判断题

2004年2月3日建设部颁布了第124号令:《房屋建筑和市政基础设施工程施工分包管理办法》,该办法规定的内容包括()

A.施工分包的种类

B.分包工程发包人的责任以及违反规定的处罚

C.分包工程承包人的责任以及违反规定的处罚

D.施工合同的签订及履行办法

E.分包工程质量管理办法

题型:判断题

Questions


·Read the following passage and choose the best word for each space.
Do you want to send an e-mail message to the White House
Good luck.
In the past, (26) President Bush — or at least those assigned to read his mail — what was (27) your mind it was necessary only to sit down at a personal computer connected to the lnternet and (28) a note to president@ whitehouse.gov.
But this week, Tom Matzzie, an online organizer with the A.F.L.-C.I.O., discovered that (29) with the White House had become a bit more (30) . When Mr. Matzzie sent an e-mail protesting (31) a Bush administration policy, the message was bounced back With an automated reply, saying he had to send it again in a new way.
Under a system (32) on the White House Website (33) the first time last week, those who want to send a message to President Bush must now (34) as many as nine Web pages and (35) a detailed form that starts by asking whether the message sender supports White House policy (36) differs with it.
The white House says the new e-mail system is an effort to be more responsive (37) the public and offer the administration "real time" access (38) citizen comments.
Completing a message to the president also requires (39) a subject from the provided list, then entering a full name, organization, address and e-mail address. (40) the message is sent, the writer must wait for an automated response (41) his message, (42) whether the addressee intended to send the message. The message is delivered to the White House only after the person using that e-mail address (43) it.
"Over (44) , it’s a very cumbersome process," said Jakob Nielsen, an authority on Web design. "It’s probably designed deliberately to (45) on their e-mail.\

A. to B. forC. ofD. over

题型:判断题

车站正线和到发线上,应装设出站信号机.设在()内方()适当地点。

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