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【单选题】
下列选项中，哪些是属于系统的基本特征的是( )。 ① 网络拓扑 ② 抗干扰性能 ③ 交换模式 ④ 话音编码 ⑤ 节能模式 ⑥ 鉴权与加密 ⑦ 软件结构A.
②③④⑤⑥
B.
②④⑤⑥⑦
C.
①②③④⑤⑥
D.
全部都是
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【简答题】Shopping in the United States changes a lot．About ninety years ago most people shopped in small stores that were owned by one person or a family．Women went from the bakery to the butcher's to the groc...
【单选题】关于预制桩施工，下列说法不正确的是（）
A.
静力压桩是利用无振动、无噪音的静压力将桩压入土中，主要用于软弱土层和邻近怕振动的建筑物（构筑物）
B.
锤击沉桩时防止对桩头的破坏应重锤轻击
C.
当桩需要进入地面以下时需要用送桩器进行送桩
D.
打桩时，为减少对周围环境的影响，可采取适当的措施，如井点降水
【单选题】What department does Martha most likely work in?
A.
Library services
B.
Sales
C.
Research
D.
Communications
【单选题】Where does this conversation most probably take place?
A.
At a department store.
B.
At a classroom.
C.
In a school.
【单选题】— I'm sorry I didn't make it to your party last night. — ____. I know you are busy these days. [ ]
A.
Of course.
B.
No kidding.
C.
That's all right.
D.
Don't mention it.
【单选题】I'm sorry I didn't recognize you just now. You look different _____. [ ]
A.
somewhat
B.
somehow
C.
anyhow
D.
anyway
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