心境的特点包括()。
A、微弱性
B、持久性
C、弥散性
D、破坏性
参考答案:A, B, C
Xiao Li is said _________ abroad, but I don’t know what country he studied in.
A.to study
B.to be studying
C.to be studied
D.to have studied
45号变压器油的凝固点是()。
A、-45℃;
B、-30℃;
C、+45℃。