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【单选题】
男性，68岁。刺激性咳嗽伴痰中带血3个月，近1月来出现声嘶就诊。痰涂片找见癌细胞，大致为鳞癌。X线示右肺上叶不张。中央型肺癌与其他原因（如结核）所致右肺上叶不X线上的显著差别是A.
气管向右侧牵拉
B.
肺体积缩小
C.
下缘呈倒S形
D.
右膈抬高
E.
患侧助间隙变窄
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举一反三
【简答题】函数y=2sinx的最小正周期是______．
【单选题】When Mary received the life-changing news, she __.
A.
lost control of herself
B.
began a balanced diet
C.
Med to get a treatment
D.
behaved in an adult way
【简答题】When my daughter was five, we gave her a piano as her birthday gift, with great excitement; she began learning piano under the teacher’s guidance. However, when she was no longer curious about it, she...
【单选题】下列微分方程所描述的系统为线性时不变系统的是（ ）
A.
y''(t) + y'(t)y(t) = f(t)
B.
y'(t) + 2y(t) = f(-t)
C.
y'(t) +3y(t) = f'(t) + 2f(t)
D.
y'(t) + 2y(t) = |f(t)|
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