【单选题】He ran back into the room to see if he ______ anything behind.
【单选题】You should always keep your personal information _________.
【单选题】A negative metacentric height ______.
A.
will always cause a vessel to capsize
B.
should always be immediately corrected
C.
always results from off-center weights
D.
All of the above are correct
【简答题】He ran back into the room to see if he (leave) _______ something behind.
【判断题】中小跨径梁或板式桥上部结构中承重的梁和板、人行道板、行车道板均为受弯构件。
【单选题】The main idea of this passage is that __________.A. we should do something helpful
A.
24. The main idea of this passage is that __________. A. we should do something helpful to other people
B.
we should pick somebody up when his car is broken
C.
we shouldn't accept money as a thank-you
D.
we shouldn't give somebody a ride in a bus
【简答题】请利用上一次实验的数据,对X,Y两个时间序列的数据进行格兰杰因果关系分析。
【单选题】(),又叫伙婚制、亚血缘家庭或普纳路亚家庭,是原始社会蒙昧时期的高级阶段所存在的群体婚姻家庭形态。是指若干数目的姊妹与若干数目的兄弟共同结婚,是同辈分男女之间的集团婚,但是却从两性关系中排除了兄弟姐妹——起初排除了同胞兄弟姐妹,后来又逐步排除了血缘关系较远的兄弟姐妹——间的通婚,因而是群婚制发展的第二阶段,亦是群婚的高级形式。