【单选题】A job opening has been announced. Which of these answer choices will be the best opening sentence in an application letter? ( )
A.
You seek a master Web engineer, and I need a job; we are perfect for each other!
B.
Dr. Matthew Skalski, IT director at Northwestern University, told me that you have an opening for a Web engineer with experience in networking, data management, and innovations.
C.
Please consider this letter my application for your opening in the IT Department.
D.
Do you need a Web engineer with over three years of experience?
【判断题】在滴定分析中,滴定管、移液管、量筒是准确的。
【判断题】如果旅游团乘坐的交通工具是火车,一般情况下,地陪应在火车抵达预定时间前 半小时向火车站问讯处询问。
【单选题】下列有关各种机械开关的说法错误的是
A.
手开关又称手闸,常用于摄影曝光的启动按钮,分单档开关和双档开关
B.
微动开关只需小位移就可让接点动作,在X线机中多用来限位或定位
C.
刷形开关和转换开关主要用于X线摄影时检查方式选择、管电流选择和曝光时间选择等,单刀双掷开关指有1个动触点,2个静触点
D.
琴键开关常用于常规X线机开关机控制、管电流选择和检查方式选择
【单选题】药品流通,包括药品生产企业的销售、药品流通企业采购与销售、()的采购与销售等。
【单选题】关于力偶,以下说法正确的是()
A.
组成力偶的两个力大小相等.方向相反,是一对作用力与反作用力。
B.
组成力偶的两个力大小相等.方向相反,是一对平衡力
【简答题】填空题。 —Where is it? —Go______ find it
【单选题】向10.00 ml 0.01 mol/L某一元酸HA溶液中逐滴加入0.01 mol/L NaOH 溶液,溶液pH变化曲线如右图所示。 下列说法不正确的是( )
B.
b点表示的溶液中:2c(Na + ) = c(A - ) + c(HA)
C.
b、c、d点表示的溶液中: c(Na + ) + c(H + ) = c(A - ) + c(OH - )