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【单选题】
图示机构中O1A= O2B=0.2m，凸轮半径r=0.1m，O1A杆左右摆动，摆动范围θϵ[55°，85°]，推动DE上下运动。图示时刻：φ=30°、θ=60°、O1A杆角速度ω=2rad/s、角加速度ε=0，求此时DE杆的速度和加速度。 【图片】A.
v =0.4 ， a =2.309
B.
v =0.1 ， a =0.4
C.
v =0.142 ， a =0.173
D.
v =0.226 ， a =0.8
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【判断题】Data de-identification, the removing of personal identifiers, has been suggested as a potential path to reconcile data sharing & privacy demands.
A.
正确
B.
错误
【简答题】According to F. de Saussure, _______ refers to the actual phenomenon or data of linguistics(utterance).
【单选题】听力原文： A new data shows nations in every part of the world, 51 in all, are suffering declining life expectancies because of an increasing prevalence of HIV infection. The impact is occurring in Asia, L...
A.
Latin America.
B.
Sub-Saharan Africa.
C.
Asia.
D.
The Caribbean.
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