基尔霍夫电流定律是说对于电路中的任一节点，流出节点的电流之和少于流入该节点的电流之和

（1）图1所示的游标卡尺主尺的最小分度是mm，副尺上有20分度（精度为0.05mm）．b₁b₂是它的外测脚，可以它用来测量圆管的______（填“外径”或“内径”）．用窄片c测量一个工件槽深时，游标附近放大图如图2，则此工件的槽深为______mm

（2）某实验小组利用图甲装置做“验证机械能守恒定律”实验，图乙是她们选择的一条较理想的纸带，O点是打点计时器打出的第一个点，计数点A、B、C、D、E、F是纸带上相邻的点．她们测出了各点与O点的距离h后做出了必要的计算，测量和计算的记录见下表（计数点的速度用v表示）

计数点	A	B	C	D	E	F
h（cm）	6.93	9.47	12.4	15.71	19.41	23.49
v（m/s）	1.16	1.37	1.56	1.75	1.95	2.14
v2（m2/s2）	1.35	1.88	2.43	3.06	4.05	4.58

①测量某点与O点距离h的记录中不合理的一组是______（填写计数点名称）

②计数点D、E、F与O点之间的距离分别用h_D、h_E、h_F表示，打点计时器的打点周期用T表示，则打下计数点E时纸带的速度v_E=______（用符号表示），重物运动的加速度a=______（用符号表示）

③该小组的同学在坐标纸上建立图丙所示坐标系，标出了各组测量数据的坐标点，并在坐标系中画出v²-h图线．由图线可以判断计数点______的测量误差较大（填写计数点名称），据图线得到重力加速度g_测______m/s²（保留三位有效数字）

④下判断中正确的是______

A．在误差允许的范围内，该实验小组达到了实验目的

B．该地的重力加速度比g_测偏大

C．她们实验操作过程中是先释放纸带然后再闭合打点计时器开关

D．实验过程中阻力引起的误差属于系统误差．

新生线带可见于（）

A.乳牙和第一恒磨牙

B.乳牙和中切牙

C.中切牙和第一恒磨牙

D.乳牙

E.恒牙

动力特质

Tidiness

Tidiness means keeping things out of sight and yet available when wanted. It implies that there is a (1) for everything and that each thing used finds its way (2) to its place by a continuos process, not by a spasmodic (3) . The process depends, however, upon the drawer, cupboard and storage (4) being provided, for lack of which one things may literally have (5) place to go. Like the perambulator and trolley, the luggage and the golfclubs (6) be homeless. The same may be true of the deck-chairs (7) the bulkier plastic toys. As there is no place for them, it is no (8) telling people to put them away. The architect who thus economises on (9) space is apt to claim that a good-sized sitting-room is (10) result. What advantage is there in that, however, (11) half the living-room has to be used for storage The aesthetic (12) depends, in turn, upon storage space. (13) it may be true that no house ever had cupboards enough, (14) are some houses which have practically no cupboards (15) all. In these our choice must lie between chronic (16) and ruthless destruction. That is not to say, however, (17) cupboard space will itself create tidiness. Some people (18) happier, it would seem, in chaos. There is the question, furthermore, (19) the cupboards themselves are tidy. That (20) has been swept out of sight is no proof, in itself, that everything can be found.

在精苯油库，轻质油槽顶部设置喷水装置的作用是（）。