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【单选题】
关于动脉血压的说法,错误的是A.
收缩压是指心室收缩射血时，动脉血压上升所达到的最高值
B.
舒张压是指心室舒张时，动脉血压下降所达到的最低值
C.
平均动脉压是指收缩压与舒张压的平均值
D.
脉压是指收缩压与舒张压之差
E.
动脉血压一般是指主动脉内的血压
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【单选题】电路如图所示 , 已知 L =0.2 H, u S = 5sin50t+10sin100t V, i ( t ) 为( )。
A.
0.5sin(50t-90°) + 0.5sin(100t-90°) Ａ
B.
0.5sin(50t-90°) + sin(100t-90°) Ａ
C.
0.5sin50t + 0.5sin100t Ａ
D.
0.5sin50t + sin100t Ａ
【单选题】I am _____ to hear the _____ news that my brother has passed the driving test.
A.
delighted; delight
B.
delighted; delightful
C.
delightful; delighting
D.
delightful; delighted
【简答题】下面是一个同学写的《课间十分钟》,你能用上面点结合的手法,把它修改得更生动、详细吗? 下课了,任君杰开始了个人演唱会表演。教室里一片喧腾。
【简答题】电路如图所示，已知u S =5cos(2000t)V，用去耦等效法求u 2 。
【单选题】I was delighted _______ her performance in NYU last night。
A.
of
B.
with
C.
from
D.
for
【单选题】Why was the use of coke smelting advantageous according to the text?
A.
It led to advances in technology.
B.
It stimulated the demand for wood.
C.
It was less expensive than wood smelting.
D.
It produced a stronger type of iron than charcoal smelting.
【简答题】电路如图所示，已知u s (t)=4ε(t)V，求：
【单选题】The demand for iron goes _____ as people do more physical exercises.
A.
on
B.
up
C.
down
D.
forward
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