发生落物卡钻时，小班泥浆工应收集记录哪些数据资料？

木块A、B分别重50 N和60 N，它们与水平地面之间的动摩擦因数均为0.25 ；夹在A、B之间的轻弹簧被压缩了2 cm，弹簧的劲度系数为400N/m。系统置于水平地面上静止不动。现用F =1N的水平拉力作用在木块B上。如右图所示.力F作用后                    (      )

A．木块A所受摩擦力大小是12.5 N

B．木块A所受摩擦力大小是8N

C．木块B所受摩擦力大小是9 N

D．木块B所受摩擦力大小是7 N

下列关于直流电机的说法，正确的是（）。

A．发电机运行时转子没有电磁转矩，而电动机运行时才有

B．电动机运行时电枢没有电动势，而发电机运行时才有

C．无论发电机还是电动机，运行时都具有相同性质的电动势

D．无论发电机还是电动机，运行时都有电磁转矩，但性质不同

完成句子

1 ．Only when you learn to respect others ,______________( 别人会尊重你) ．(respect)

2 ．Had I followed your advice to take with my umbrella ,I ________________( 就不会淋雨) ,so now

I am running a high fever.(catch)

3 ．________________( 他们过着多么艰辛的生活) before they became famous !(What)

4 ．________________( 他被选中)as an actor in the film made the family delighted.(choose)

5 ．Not ________________( 收到他的邀请) ,I didn't go to his wedding party.(receive)

6 ．Since the beginning of the vacation ,I ______________( 旅游)across the country ,and my next stop

is Mount Tai.(travel)

7 ．The international agreement ,________________( 计划)to encourage children not to smoke and

help people kick the habit ,was signed yesterday.(intend)

8 ．If your order is ready ,the T －shirt ________________( 送达你处)as soon as possible.(deliver)

9 ．Professor Smith ,along with his assistants ,____________________( 研究这个项目)day and night

to meet the deadline.(work)

10 ．Such poets as Shakespeare are widely read ,of whose works ,however ,some ________________

( 难以理解) ．(understand)

在牙体预备时未做预防性扩展可能导致的主要不良后果是（）

A.修复体固位力差

B.修复体抗力形差

C.咬合痛

D.修复体就位难

E.易发生继发龋

Excel2000工作表可以进行智能填充时，鼠标的形状为______。

A．空心粗十字

B．实心细十字

C．向右上方箭头

D．向左上方箭头