试题与答案

收集痰液脱落细胞检查的标本时应注意() A.留取清晨自然咳出的痰液 B.留取清晨用力

题型:多项选择题

题目:

收集痰液脱落细胞检查的标本时应注意()

A.留取清晨自然咳出的痰液

B.留取清晨用力由深部咳出的痰液

C.标本立即送检

D.挑选血性和脓性部分痰液

E.留取清晨漱口后第一口痰液

答案:

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下面是错误答案,用来干扰机器的。

1-6 BCDEFA

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(     )10. A. for               
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题型:问答题

同学们知道,将两个金属电极插入任何一个水果中就可以做成一个水果电池,但日常生活中我们很少用“水果电池”,这是为什么呢?某学习小组的同学准备就此问题进行探究.

(1)同学们通过查阅资料知道将锌、铜两电极插入水果中,电动势大约会有1伏多一点.晓宇同学找来了一个土豆做实验,当用量程为0~3V、内阻约50kΩ的伏特表测其两极时读数为0.96V.但当他将四个这样的水果电池串起来给标称值为“3V,0.5A”的小灯泡供电时,灯泡并不发光.检查灯泡、线路均没有故障,而用伏特表测量其电压确实能达到3V多.据您猜想,出现这种现象的原因应当是:______(不要求写分析、推导过程).

(2)晓宇同学用欧姆表直接测“土豆电池”的两极,读得此时的读数为30Ω.小丽同学用灵敏电流表直接接“土豆电池”的两极,测得电流为0.32mA,根据前面用伏特表测得的0.96V电压,由全电路欧姆定律得:r=

E
I
=
0.96
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Ω=3.0kΩ.因而晓宇同学说土豆的内阻为30Ω,而小丽同学则说是3kΩ.请你判断,用晓宇或小丽同学的方法测量“土豆电池”的内阻,结果是否准确,为什么?请分别说明理由.

(3)若实验室除了导线和开关外,还有以下一些器材可供选择:

A.电流表A1(量程为0~0.6A,内阻为1Ω)

B.灵敏电流表A2(量程为0~0.6mA,内阻为800Ω)

C.灵敏电流表A3(量程为0~300μA,内阻未知)

D.滑动变阻器R1 (最大阻值约10Ω)

E.滑动变阻器R2(最大阻值约2kΩ)

F.定值电阻(阻值2kΩ)

G.变阻箱(0~9999Ω)

①为了能尽可能准确测定“土豆电池”的电动势和内阻,实验中应选择的器材是______(填器材前的字母代号).

②在右方框中画出应采用的电路.

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