These microplastics included a _32_ commonly known as PET and widely used in the manufacture of clothing and food and liquid containers.
A. adequate
B. admiring
C. contains
D. defending
E. evidence
F. instant
G. liquid
H. modified
I. natural
J. potential
K. released
L. revealing
M. sealed
N. solves
O. substance
查看答案
Would you still be drinking it if you knew that more than 90 percent of all bottled water sold around the world _29_ microplastics?
A. adequate
B. admiring
C. contains
D. defending
E. evidence
F. instant
G. liquid
H. modified
I. natural
J. potential
K. released
L. revealing
M. sealed
N. solves
O. substance
两斜截面方位角相差180o，则两斜截面上的正应力、切应力是一样的
A. 对
B. 错
一个点应力状态有几个主平面（）
A. 两个
B. 最多不超过三个
C. 无限多个
D. 一般情况下有三个，特殊情况下有无限多个
纯弯曲梁内各点的应力状态都是单向应力状态
A. 对
B. 错
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