我们日常生活所用的交流电频率是50Hz,如果用它做电源,打点计时器每隔_____

题型:填空题

问题:

我们日常生活所用的交流电频率是50Hz,如果用它做电源,打点计时器每隔______s打一个点,则连续打5个点所用的时间是______s.

考点:打点计时器
题型:填空题

直复营销最主要的特征是()。

A.不可预测性

B.目标顾客选择一般是正确的,有极少数不准确

C.不刻意强调与顾客的关系

D.隐蔽的营销战略

题型:填空题

WASHINGTON — The U.S. government remains shut down in a partial closure   小题1:  has put hundreds of thousands of Americans out of work, at least temporarily. Lawmakers have yet to reach common ground, and that means many federal workers stay home   小题2: national parks, monuments and museums stay closed. Some vocal veterans’ groups visited Washington over the weekend   小题3:  protest the closures. But they were not the only ones there. Seeking their place in the spotlight   小题4:   lawmakers publicly supporting the “Tea Party,” a group of lawmakers within the Republican Party strongly opposed to compromising   小题5:  Democrats on matters of budget.

The Million Veterans March - as it was called - was supposed to be a peaceful call for   小题6:  end to the government shutdown now threatening many veterans’ benefits.

Protesters tore down barricades(临时的路障) and carried   小题7:   to the White House where they threw them in front of the gates and shouted slogans against the president.

“It is time that Congress started the government again. Veterans paid a price. Promises were made to them that   小题8:   they serve our country, our country will take care of them. We’re failing in that mission,” said one of the protesters Kelly.

题型:填空题

海南的传统节日——端午节又到了,海南人民包粽子是此节日的习俗。保存粽子常采用真空包装,这是为了隔绝:

A.氮气

B.氢气

C.氧气

D.稀有气体

题型:填空题

根据民法通则的规定,( )周岁以下的未成年人是无民事行为能力入。

A.8

B.10

C.15

D.16

题型:填空题

煤中灰分越高煤的发热量越低。

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