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【单选题】
对于一阶RC电路的零输入响应的时间常数为( )。A.
R
B.
C
C.
R/C
D.
RC
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举一反三
【单选题】.张某,女性,35岁,颈前部逐渐增大、增粗,不对称,超声显示:甲状腺肿大呈多个结节,彩色多普勒血流显像血流丰富,绕结节而行,这最可能是
A.
毒性甲状腺肿
B.
亚急性甲状腺炎
C.
桥本氏病
D.
结节性甲状腺肿
E.
以上都不是
【单选题】采用的给水装置安装位置灵活,可设在高处也可设在低处,但调节容积小、 金属耗量大、造价较高,这种给水方式是( )
A.
气压给水方式
B.
变频调速泵给水方式
C.
水池—水泵—水箱给水方式
D.
单设水箱给水方式
【单选题】【R6】 SOME RITUALS OF MODERN DOMESTIC LIVING VARY LITTLE THROUGHOUT THE DEVELOPED WORL D. ONE SUCH IS THE MUNICIPAL REFUSE COLLECTION, USUALLY ONCE A WEEK, YOUR RUBBISH BAGS OR THE CONTENTS OF YOUR BIN...
A.
TRUE, THE NUMBER OF BAGS OR CANS COLLECTED DID FALL SHARPLY, BY 37% BETWEEN MAY AND SEPTEMBER 1992. BUT RATHER THAN BUY MORE TAGS, PEOPLE SIMPLY CRAMMED MORE GARBAGE — ABOUT 40% MORE INTO EACH CONTAINER.
B.
THIS LOOKS LIKE THE MOST BASIC OF ECONOMIC MISUNDERSTANDINGS: IF RUBBISH DISPOSAL IS FREE, PEOPLE WILL PRODUCE TOO MUCH RUBBIS H. THE OBVIOUS ECONOMIC SOLUTION IS TO MAKE HOUSEHOLDS PAY THE MARGINAL COST OF DISPOSING OF THEIR WAST E. THAT WILL GIVE THEM AN INCENTIVE TO THROW OUT LESS AND RECYCLE MOR E.
E.
CITY AUTHORITIES ARE NOW CONSIDERING A PROJECT TO TEACH GOVERNMENT WASTE COLLECTORS THE SKILLS, SUCH AS WHAT RUBBISH TO COLLECT AND HOW TO CLASSIFY IT. IF APPROVED, THE PROJECT WILL HELP EASE THE FINANCIAL BURDEN OF THE CITY'S WASTE TREATMENT. D. IT WOULD BE FOOLISH TO GENERALIZE FROM THIS ONE CASE, BUT THE MORAL IS CLEAR, ECONOMIC INCENTIVES SOMETIMES PRODUCE UNFORESEEN RESPONSES. E. LESS PLEASING STILL, SOME PEOPLE RESORTED TO ILLEGAL DUMPING RATHER THAN PAY TO HAVE THEIR RUBBISH REMOVE D. THIS IS HARD TO MEASURE DIRECTLY. BUT THE AUTHORS, OBSERVING THAT A FEW HOUSEHOLDS IN THE SAMPLE STOPPED PUTTING RUBBISH OUT, GUESS THAT ILLEGAL DUMPING MAY ACCOUNT FOR 30% — 40% OF THE REDUCTION IN COLLECTED RUBBIS H.
F.
BUT AT THE MARGIN THE PRICE IS ZERO: THE FAMILY THAT FILLS FOUR BINS WITH RUBBISH EACH WEEK PAYS NO MORE THAN THE ELDERLY COUPLE THAT FILLS ON E.
【单选题】We had tried everything to improve their living conditions, but it made little ______.
A.
good
B.
use
C.
result
D.
difference
【单选题】We need an effective strategy to help children living in ______ poverty to have the opportunity to receive ______ good education.
A.
/ ; a
B.
a ; /
C.
/ ; the
D.
the ; a
【单选题】'已知两直线的方程分别为 则( ).'
A.
L 1 与 L 2 平行，但不重合;
B.
L 1 与 L 2 仅有一个交点;
C.
L 1 与 L 2 重合;
D.
L 1 与 L 2 是异面直线.
【单选题】【R10】 SOME RITUALS OF MODERN DOMESTIC LIVING VARY LITTLE THROUGHOUT THE DEVELOPED WORL D. ONE SUCH IS THE MUNICIPAL REFUSE COLLECTION, USUALLY ONCE A WEEK, YOUR RUBBISH BAGS OR THE CONTENTS OF YOUR BI...
A.
TRUE, THE NUMBER OF BAGS OR CANS COLLECTED DID FALL SHARPLY, BY 37% BETWEEN MAY AND SEPTEMBER 1992. BUT RATHER THAN BUY MORE TAGS, PEOPLE SIMPLY CRAMMED MORE GARBAGE — ABOUT 40% MORE INTO EACH CONTAINER.
B.
THIS LOOKS LIKE THE MOST BASIC OF ECONOMIC MISUNDERSTANDINGS: IF RUBBISH DISPOSAL IS FREE, PEOPLE WILL PRODUCE TOO MUCH RUBBIS H. THE OBVIOUS ECONOMIC SOLUTION IS TO MAKE HOUSEHOLDS PAY THE MARGINAL COST OF DISPOSING OF THEIR WAST E. THAT WILL GIVE THEM AN INCENTIVE TO THROW OUT LESS AND RECYCLE MOR E.
E.
CITY AUTHORITIES ARE NOW CONSIDERING A PROJECT TO TEACH GOVERNMENT WASTE COLLECTORS THE SKILLS, SUCH AS WHAT RUBBISH TO COLLECT AND HOW TO CLASSIFY IT. IF APPROVED, THE PROJECT WILL HELP EASE THE FINANCIAL BURDEN OF THE CITY'S WASTE TREATMENT. D. IT WOULD BE FOOLISH TO GENERALIZE FROM THIS ONE CASE, BUT THE MORAL IS CLEAR, ECONOMIC INCENTIVES SOMETIMES PRODUCE UNFORESEEN RESPONSES. E. LESS PLEASING STILL, SOME PEOPLE RESORTED TO ILLEGAL DUMPING RATHER THAN PAY TO HAVE THEIR RUBBISH REMOVE D. THIS IS HARD TO MEASURE DIRECTLY. BUT THE AUTHORS, OBSERVING THAT A FEW HOUSEHOLDS IN THE SAMPLE STOPPED PUTTING RUBBISH OUT, GUESS THAT ILLEGAL DUMPING MAY ACCOUNT FOR 30% — 40% OF THE REDUCTION IN COLLECTED RUBBIS H.
F.
BUT AT THE MARGIN THE PRICE IS ZERO: THE FAMILY THAT FILLS FOUR BINS WITH RUBBISH EACH WEEK PAYS NO MORE THAN THE ELDERLY COUPLE THAT FILLS ON E.
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