保险公司给予纳税人的无赔款优待，应计入当年应纳税所得额。( )

在一次实验活动比赛中，老师给定了以下器材：一个输出电压为9V的稳压电源、一只电压表、一个电阻箱、一个最大值为20Ω的滑动变阻器、两只开关以及导线若干，要求测定一只额定电压为6V的小灯泡的额定功率．聪明的李明设计 了如图甲所示的电路图，顺利完成了实验．

（1）请根据甲图所示的电路图，用铅笔画线代替导线将乙图中电压表正确接入实物电路中．

（2）李明在实验时，首先闭合开关S₁，观察到电压表表盘示数如丙图所示，要使小灯泡两端电压达到额定电压，应将甲图电路中滑动变阻器R的滑片P向　　 端滑动（选填“a”或“b”）．

（3）调节滑片P使电压表示数等于6V后，保持滑动变阻器R的滑片P位置不动，断开开关S₁，再闭合开关S₂，调整电阻箱R′接入电路的阻值，使电压表的示数再次等于6V，此时电阻箱的示数如丁图所示，则电阻箱接入电路的阻值为　       　Ω，由此可知小灯泡的电阻为         　　Ω．小灯泡电阻的得出是运用了物理研究中的　    　  （选填“控制变量法”或“等效替代法”）．根据以上获得的实验数据可知小灯泡的额定功率为         　W． 

短文改错。

    It is interested to visit another country, but sometimes there are some questions when we don't know the

language very well. It may be difficult to talk about the people there. We may not know how to use the

telephone in the country which are visiting. We may not know what to buy the things we need. In a strange

country we may not know where to eat and what to order in a restaurant. It is not easy to decide how many

money to tip (小费) waiters or taxi drivers. When we are helpful, we may not know how to ask help. After

a short time later, however, we learn what to do and what to say. We learn to enjoy life in another country,

and then we may be sorry to leave both the place and the people.

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下列不属于内分泌腺的特点的是（　　）

A．分泌物是激素

B．分泌物由导管输送

C．分泌物随血液循环输送到全身各处

D．分泌物直接进入腺体内的毛细血管

下列共价键的键能最大的是

A．HF

B．HCl

C．HBr

D．HI

字长为7位的无符号二进制整数能表示的十进制整数的数值范围是( )。

A．0～128

B．0～255

C．0～127

D．1～127