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【简答题】
等比数列 的前 n 项和为 ，已知 ， ， 成等差数列，则 的公比为______。
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皮皮学刷刷变学霸
举一反三
【单选题】What is meant by “concert songs” in the seventh paragraph?
A.
Songs sung by zebra finches at a concert.
B.
Songs sung by male finches for female finches.
C.
Songs sung by female finches for male finches.
D.
Songs sung by male finches to many female finches.
【单选题】What is meant by 'concert songs' in the seventh paragraph?
A.
Songs sung by zebra finches at a concert.
B.
Songs sung by female finches for male finches.
C.
Songs sung by male finches for female finches.
D.
Songs sung by male finches to many female finches.
【单选题】38 What is meant by 'concert songs' in paragraph 7?
A.
Songs sung by zebra finches at a concert.
B.
Songs sung by female finches for male finches
C.
Songs sung by male finches to other finches.
D.
Songs sung by male finches for female finches
【单选题】正常窦性心律的心电图特征,下面正确的是( )
A.
P波规律出现，P-R间期≥0.12S
B.
同一导联中 P-P间期差值≤0.16S
C.
P波Ⅱ、Ⅲ、avF导联直立，avR导联倒置
D.
可伴有继发性 ST段轻度压低
【简答题】测定灰分含量使用的灰化容器,主要是______、_______。
【单选题】What does the professor NOT mention as an influence of jazz?
A.
Spiritual songs.
B.
Work songs.
C.
Polkas.
D.
The blues.
【单选题】窦性心动过速心电图特征以下说法正确的是
A.
窦性P波规律出现，频率＞100次／分，P—P间隔＜0．6秒
B.
窦性P波或R—R间隔长短不一，相差＞0．12秒
C.
窦性P波消失，代之以大小及规律不一的f波，QRS波群形态正常
D.
QRS波群与T波消失，呈完全无规律的波浪状曲线
E.
心室率通常在100～160次／分
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