下列不是技术措施:()
A.工作票制度;
B.检电;
C.接地封线;
D.悬挂标示牌及装设防护物。
参考答案:A
A person is said to be unreliable if what he does is _______ what he says. [ ]
A. on the contrary to
B. contradictory to
C. appropriate to
D. appealing to
论述盾构选型的主要原则。