甲船在岛B的正南方A处，AB＝10千米，甲船以每小时4千米的速度向正北航行，同时乙船自B出发以每小时6千米的速度向北偏东60°的方向驶去，当甲、乙两船相距最近时，它们所航行的时间是(　　)

题干

A：分钟

B：分钟

C：21.5分钟

D：2.15分钟

上一题下一题 0.0难度选择题更新时间:2019-04-20 05:55:43

A

本校将举行学校开放日活动, 邀请学生家长来校观摩体验真实学校课堂和活动。请查看学校开放日安排表, 以校长的身份挑选表格中的两日, 拟一份邀请函给家长。

①包含所选活动日的全部信息, 并给出你认为恰当的理由。

②不得出现真实姓名, 学校等。

③字数80。

School Day
	A.M.	Activities	P.M.	Activities
Mon.	8:00-10:00	opening of our new library visit the new library	2:30-4:00	A stage drama about “Alice in Wonderland”
Tues.	10:00-11:00	A report on “Family Education”	2：00-4:00	Parent-child games
Wed.	11:00-11:40	A class meeting about DIY	1:00-2:30	visit the whole school
Thurs.	8:00- 9:30	Public classes of Chinese and math	2:30-4:00	A basketball game between two schools
Fri.	8:00- 9:30	Public classes of English and science	2:30-3:30	An English speech competition about “ My future life”

Dear parents,

I would like to invite you to our School day next week.

……Please reply in writing to this invitation my Friday, May 28^th.

Larry Smith

Headmaster