Which of the following can be referred to as a time signal()
A. after that
B. as a result
C. after all
D. in a word
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The verb “endure” in the sentence “Some friendships endure while others do not” means____()
A. tolerate
B. last
C. change
D. survive
惠更斯-菲涅耳原理的基本内容是:波前上各面积元所发出的次波在观察点P的相干叠加,决定了P点的合振动及光强()
工程结算的编制单位是()
A. 建设单位
B. 施工单位
C. 监理单位
D. 咨询单位
目前在线开放课程的主流形态是()
A. MOOC
B. SPOC
C. 视频公开课
D. 资源共享课