在原工作票的停电及安全措施范围内增加工作任务时，应由工作负责人征得（）和工作许可人同意，并在工作票上增填工作项目。
A.当值调度
B.领导
C.工作票签发人
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APP具体操作流程为：
已知一元二次方程x2+mx+3=0的一个根为-3，则m=（ ）。
（4分）化学就在我们身边，它能改善我们的生活。请从“ 氧气 、氖气、氢气、二氧化硫”中选择适当的物质填空：
（1）抢救危重病人常用的物质是 ；（2）相同状态下密度最小的气体是_____
（3）可用于制造霓虹灯的是 ； （4）能引起大气污染造成酸雨的是 ；
对2007年1月1日或以后建造的船舶，经排放压载以后的舱内或有关管系内的残留物的最大允许残留量，对X、Y和Z类物质均为（）。
A．75L
B．100L
C．150L
D．300L
My life as a little person is filled with stories. I enjoy talking to children and explaining why I look different from their parents．It has taken many years of 36 my confidence to be able to do that． I didn’t 37 how short I was until I started school．As time went on，I just tried to smile and accept the fact that I was going to be 38 my whole life．I was determined to make my 39 an advantage rather than a disadvantage．My friends became increasingly 40 . They’d help me up the bus steps．If people were cruel，they would take them aside and 41 them． 42 I lacked in height，I 43 in personality my ability to laugh，even at myself．For example，one time I was 44 the washing machine at my parents’ house to grab the wet clothes．I fell 45 in and yelled for Mother，who was sitting nearby reading the paper．Watching feet 46 everywhere，she laughed and said，“I should leave you in there.” I 47 her． I’m 47 now，and the 48 have not reduced as I’ve grown older．People ask my friends if I live in a dollhouse．They look 49 when they see me get out of my car on the driver’s side．During those times，I try to keep a good 50 . When people are rude，I 51 myself，“Look what else I have --a great family，nice friends.” And it’s the children’s questions that make my life 52 ．“Why are you so short? How old are you? Are you a mommy?” When I talk with children，they are left 53 that their questions have been answered．My hope is that in taking time with them，I will 54 them to accept their peers，whatever size and shape they come in， 55 treat them with respect．
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找正两半体对称半圆孔工件是，既要校正工件端面上的平分线，又要形状平分线及侧母线对车床的（）。
A.校正
B.加工
C.划线
D.测量