仙人掌的叶变态成刺的主要原因是（）。 ["减少光合作用","保护不被其它生物危害","降低植物体的温度","减少水分散失"]
上世纪90年代，“末位淘汰”这种企业管理模式开始进入中国，作为一种绩效考评方法被越来越多的行业和企业采用。比如，国内某电脑集团曾宣布每半年将“末位淘汰”其5％的员工；一位企业总裁曾在一次演讲中认为，实行“末位淘汰”走掉一些落后的员工有利于保护优秀的员工，其目的是要激活整个组织。“末位淘汰”只是裁掉落后的人、裁掉那些不努力工作的员工或不胜任工作的员工。近年来，很多企业将“末位淘汰”写入企业内部规章制度作为企业与职工解除劳动合同、终止合同的条件，就此问题谈谈你的看法？
破碎顶板采煤工作面支护应尽量采用下列什么形式？（） ["单体液压支柱和金属铰接顶梁","错梁直线柱","齐梁直线柱","木支柱"]
Examine the description of the CUSTOMERS table: CUSTOMER_ID NUMBER(4) NOT NULL CUSTOMER_NAME VARCHAR2(100) NOT NULL STREET_ADDRESS VARCHAR2(150) CITY_ADDRESS VARCHAR2(50) STATE_ADDRESS VARCHAR2(50) PROVINCE_ADDRESS VARCHAR2(50) COUNTRY_ADDRESS VARCHAR2(50) POSTAL_CODE VARCHAR2(12) CUSTOMER_PHONE VARCHAR2(20) The CUSTOMER_ID column is the primary key for the table. Which statement returns the city address and the number of customers in the cities Los Angeles or San Francisco?（） ["SELECT city_address, COUNT(*) FROM customers WHERE city_address IN ('Los Angeles', 'San Francisco');","SELECT city_address, COUNT(*) FROM customers WHERE city_address IN ('Los Angeles', 'San Francisco') GROUP BY city_address;","SELECT city_address, COUNT(customer_id) FROM customers WHERE city_address IN ('Los Angeles', 'San Francisco') GROUP BY city_address, customer_id;","SELECT city_address, COUNT(customer_id) FROM customers GROUP BY city_address IN ('Los Angeles', 'San Francisco')"]
Ⅱ、Ⅲ度房室传导阻滞宜用（） ["肾上腺素","去甲肾上腺素","酚妥拉明","多巴胺","异丙肾上腺素"]
引发不良情绪的非理性观念可以概括为（）、（）、糟糕至极这三大特征。
