隐性感染后获得的免疫属于()A.人工被动免疫  B.人工主动免疫  C.自然主动免疫

题型:单项选择题

问题:

隐性感染后获得的免疫属于()

A.人工被动免疫 

B.人工主动免疫 

C.自然主动免疫 

D.自然被动免疫 

E.过继免疫

考点:医学免疫学医学免疫学题库
题型:单项选择题

There are about 75 brands of microwave popcorn on the market; altogether, they account for a little over half of the money from sales of microwave food products. It takes three minutes to pop corn in the microwave, compared to seven minutes to pop corn conventionally. Yet by weight, microwave popcorn typically costs over five times as much as conventional popcorn. Judging by the popularity of microwave popcorn, many people are willing to pay a high price for just a little additional convenience.
If the statements in the passage are true, which one of the following must also be true

A.No single brand of microwave popcorn accounts for a large share of microwave food product sales.

B.There are more brands of microwave popcorn on the market than there are of any other microwave food product.

C.By volume, more microwave popcorn is sold than is conventional popcorn.

D.More money is spent on microwave food products that take three minutes or less to cook than on microwave food products that take longer to cook.

E.(E) Of the total number of microwave food products on the market, most are microwave popcorn products.

题型:单项选择题

麻黄治疗风寒表实证,常与其相须为用的药物是()。

A.荆芥

B.防风

C.细辛

D.桂枝

E.香薷

题型:单项选择题

进货渠道要根据()来选择。

A、市场需要

B、地区特点

C、消费对象和商品特点

D、市场需要、地区特点、消费对象和商品特点

题型:单项选择题

女患者,33岁,既往月经规律,胸胁胀满,月经停闭3月余,伴头晕恶心,心烦易怒,失眠多梦,查尿妊娠试验阴性,治疗首选方剂是:

A.血府逐瘀汤
B.少腹逐瘀汤
C.桃红四物汤
D.膈下逐瘀汤
E.加味逍遥散

题型:单项选择题

某施工单位承接了一座桥梁和一条隧道施工任务。桥梁采用明挖扩大基础,基础采用现浇钢筋混凝土结构,承台混凝土体积约为300m3,基坑开挖深度为4m,原地面往下地层依次为:0~50cm腐殖土,50~280cm粘土,其下为淤泥质土,地下水位处于原地面以下200cm,由于受周围地物的影响,施工现场场地有限。根据该桥墩的水文地质,施工单位在基坑开挖过程中采取了挡板支撑的加固措施,以防止边坡不稳造成塌方;在挖除基础底部底层松软土、换填10~30cm厚砂砾土垫层、使其符合基底的设计标高并整平后,即立模灌筑承台础混凝土。

为控制混凝土的水化热,施工单位采取了以下措施:

(1)选用水化热低的水泥;

(2)选用中、粗砂,石子选用0.5~3.2cm的碎石和卵石;

(3)选用复合型外加剂和粉煤灰以减少绝对用水量和水泥用量,延缓凝结时间。在隧道施工中,由于有大量爆破施工。

为了方便管理,爆破器材放在紧靠办公室的一个小仓库里,并且由专人负责发放。在进行洞口的大型爆破之前,施工单位技术人员经过计算确定了爆破药量、爆破方式以及安全距离,让民工甲领取了炸药和雷管,用自行车运到施工现场。爆破作业时,安排民工乙负责在爆破安全距离外来回走动进行警戒。

施工单位为控制大体积混凝土承台混凝土水化热的措施是否合理?除此以外,还可以采取哪些措施?

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