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【单选题】
今有一球形肥皂泡,半径为R,肥皂水溶液的表面张力为r,则肥皂泡内附加压力是A.
△P=2r/R
B.
△P=r/2R
C.
△P=4r/R
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【简答题】简述单元主题活动设计的步骤。
【多选题】下列海关监管起止时间描述正确的是（ ）
A.
一般进口货物，自货物进境之时起至海关放行时止
B.
暂时进境货物，自货物进境时起至货物复运出境并销案止
C.
特定减免税货物，自货物进境之时起至海关监管年限届满或办结相关海关手续止
D.
保税加工进口货物，，自货物进境之时起至加工成品复运出境并核销时止
【单选题】听力原文：M: I wish i could be the person driving that new Cadillac instead of Barbara. W: Well, if you would budget your money more carefully, this wouldn't be a problem. Q: How does the woman feel about ...
A.
She thinks that he should plan his money more carefully.
B.
She thinks that he should buy a convertible.
C.
She thinks that he should ask Barbara for advice.
D.
She wants him to manage her money
【单选题】听力原文：M: I wish I could be the person driving that new Cadillac instead of Barbara. W: Well, if you would budget your money more carefully, this wouldn't be a problem. Q: How does the woman feel about ...
A.
She thinks that he should plan his money more carefully.
B.
She thinks that he should buy a convertible.
C.
She thinks that he should ask Barbara for advice.
D.
She wants him to manage her money.
【单选题】I wish I could be ________so that I could be able to sneak around and see things I would not normally be able to see.
A.
inaccurate
B.
inefficient
C.
ineffective
D.
invisible
【判断题】帆拱 是 在方形平面的四边发券,在四个券之间砌筑以对角线为直径的穹顶,又在四个券的顶点做水平切口,水平切口和 4个发券之间的4个角上的球面三角形部分,称为帆拱。
A.
正确
B.
错误
【简答题】下面是一个单元主题活动的设计结构
主题：在农场
活动一：社会：参观农场养鸡
活动二：音乐：歌曲“在农场”
活动三：美术：画鸡
活动四：常识：认识家禽
活动五：计算：鸡鸭数量比较
请问：此单元主题活动设计存在的主要问题，请结合案例具体分析。
【简答题】在编写80C51单片机中断程序时,入栈指令用PUSH,则出栈指令用( )。
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