在力学上，物体具有两种平衡状态，一般平面力系的平衡条件不包括（）。A．∑X=0 B． 发布时间：2018-07-12 21:35 │ 来源：www.tikuol.com 题型：单项选择题 问题： 在力学上，物体具有两种平衡状态，一般平面力系的平衡条件不包括（）。A．∑X=0B．∑W＝0C．∑Y＝0D．∑M＝0
题型：单项选择题 阅读理解。Welcome to the zoo Come and meet the Indian (印度的) elephants and the new tigers from America. The bears are waiting to meet you, and the monkeys from China are waiting to throw things at you. The lovely dogsfrom Australia are waiting to laugh at you. The giraffes from Zambia are waiting to look down on. TicketsOpening timeAdults:＄2.00Children:＄1.00Under 12: Free Friday, 10:00a.m----3:00p.m. The other days9:00a.m----4:00p.m. Keep the zoo clean! Do not touch, give food to or go near the animals.根据短文内容完成选择。1. How many kinds of animals are talked about in the passage?A. Four B. FiveC. Six D. Seven2. Now Mr. Smith is in the zoo with his two sons, one aged 14 and the other 10. How much are the tickets altogether (总共)?A. ＄4.00 B. ＄2.00 C. ＄3.00 D. ＄1.003. Which of the following is a visiting time?A. 8:30 a.m. Monday. B. 9:30 a.m. Friday.C. 5:00 p.m. Tuesday. D. 2:00 p.m. Sunday.4. From the passage we can guess the animal "giraffe" must be very _____.A. fat B. long C. tall D. strong5. Which of the following can we do in the zoo?A. Take a few nice photos. B. Give some food to the fishC. Touch the monkey on the head. D. Throw things everywhere. 查看答案
题型：单项选择题 DNA的A260=1.0相当于（）A.10μg／ml双链DNAB.20μg／ml双链DNAC.30μg／ml双链DNAD.40μg／ml双链DNAE.50μg/ml双链DNA 查看答案
题型：单项选择题 生物碱的分类方法有数种，一按植物来源分类，二按生物碱生源途径分类，三按氮原子存在的主要杂环母核类型分类，现按已知生物碱主要母核分。属于莨菪烷类生物碱有（）A.阿托品B.去甲乌药碱C.麻黄碱D.苦参碱E.毛果芸香碱 查看答案
题型：单项选择题 患者女性，48岁，近2个月来日常活动可引起气急、心悸症状、评估此病人心功能为II级，应如何指导该病人活动 A．绝对卧床但应取半卧位 B．可照常工作 C．限制活动 D．稍事活动 E．轻体力工作，下午多休息 查看答案