试述阀调整的主要内容是什么?
参考答案:㈠测调汽缸间隙:
①求撞缸线;
②求死点;
③测定汽缸间隙;
㈡测调导程:
①测定汽上标记;
②求导程;
③导程的调整。
— What are the _______ doing there?
— They are busy _______ their science experiment.
A.Boys students; to do
B.Boy students; to do
C.Boys students; doing
D.Boy students; doing
船长在决定弃船后,应()。
Ⅰ.亲自发出弃船警报信号,并向外发出遇难求救信号;
Ⅱ.任弃船行动总指挥;
Ⅲ.督促、检查有关人员做好弃船前的准备工作;
Ⅳ.督促、检查有关人员按应急部署表上规定,携带指定物品登乘艇筏。
A.Ⅰ~Ⅲ
B.Ⅰ,Ⅲ,Ⅳ
C.Ⅱ~Ⅳ
D.Ⅰ~Ⅳ