皮皮学，免费搜题
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【单选题】
稗草烯：α-（2，2，2 -三氯乙基）苯乙烯 ( )，它是一种选择性内吸传导性除草剂。主要用于水稻田防除稗草，温度和湿度对药效影响大，温度高、湿度大药效发挥快。在同一剂量下，15℃以下只能起抑制作用，25℃以上3～5天杂草就枯死。对水稻安全，但施药期不当、用量过大、施药不均等也易产生药害。已知同一碳原子连两个羟基极不稳定( )，下列说法不正确的是 [ ]A.
该物质能使溴水褪色
B.
该物质能在碱性条件下水解生成羧酸钠
C.
可用 在光照条件下与Cl 2 通过取代反应制得纯度较高的稗草烯
D.
稗草烯在一定条件下可发生加聚反应
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【判断题】When you are writing the date of a memo, you can write the month in abbreviated form.
A.
正确
B.
错误
【单选题】You are writing a memo to employees announcing the loss of free parking. Which of the following would be the best closing sentence in this bad-news memo to employees? ( )
A.
We understand your disappointment with this decision.
B.
If you would like to sign up for our ride-sharing program to save on parking expenses, please see the receptionist.
C.
We trust you will continue to do your best in spite of the present difficult situation.
D.
Thank you in advance for your cooperation.
【单选题】Which of the following is NOT a point you should remember in writing a memo?
A.
be rude to your reader
B.
be concise
C.
come to the point first
D.
be coherent
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