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【单选题】
“压痕线”通常采用()线表示。A.
0.5pt，实线
B.
0.5pt，虚线
C.
0.75pt，虚线
D.
1pt，实线
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举一反三
【简答题】求该周期信号cos(10t)-cos(30t) 的周期().A. π/5 B. π C.2π D.4π
【单选题】----He was nearly drowned once ． ---- When was ______? -----_____ was in 2000 _____he was in middle school ．
A.
that; It ; when
B.
this ;This; that
C.
that; This; when
D.
that; It ; that
【单选题】So seriously _____ in the accident that he was sent to hospital at once.
A.
he was wounded
B.
was he hurt
C.
he did injure
D.
did he hurt
【单选题】--- He’s never late for school, _____ he? ---_______________, but once he asked for a sick leave（病假）.
A.
has；No
B.
has; Yes
C.
is; Yes
D.
is, No
【单选题】周期信号cos(10t)-cos(30t)和ej30t的周期T分别为____和____.
A.
pi/10;pi/5
B.
pi/5;pi/10
C.
pi/5;pi/5
D.
pi/5;pi/15
【多选题】患者,男,34岁,足底被绣钉刺伤后8天,出现全身肌肉强直性收缩和阵发性痉挛1天,诊断为破伤风。对于破伤风患者的处理原则以下说法正确的是
A.
将病人安置于单人隔离病室，保持安静，遮光
B.
避免各类干扰，医护人员说话、走路要低声、轻语
C.
使用器具时避免发出噪音
D.
治疗、护理等各项操作尽量集中，避免刺激病人引起抽搐
E.
拉开窗帘，让阳光照进病房
【单选题】----- He was nearly drowned once. ----- When was ____? ------ _____was in 1998 when he was in middle school.
A.
that; It
B.
this; This
C.
this; It
D.
that; This
【简答题】He once worked in a company, ______ he went abroad for further study. A. from which B. after that C. after which D. from this
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