题目:
面罩上的护目玻璃起到减弱电弧光并过滤()。
A、红外线
B、紫外线
C、X射线
答案:
参考答案:A
面罩上的护目玻璃起到减弱电弧光并过滤()。
A、红外线
B、紫外线
C、X射线
参考答案:A
Many Tuesday mornings, I have coffee with my father. Although my father is a man of few words, I really ____ the time along with him. One recent Tuesday, I found it a bit ___ when I rang the doorbell, no one seemed to be home. I climbed in through the window, noticing the lights that shone from the kitchen, and ____ that my dad must be there, but he wasn't. I ____ through his home, checking every room. I tried not to ____.Yet, upstairs, downstairs, no Dad anywhere. I was worried. ____, my father was seventyone years old. Anything could have happened to him. Then, I got in my car and drove to my mother's aerobics(有氧运动)class. On the drive, I thought a lot about my father and our ____ together. Suddenly, I was three years old and he was ____ me up to the living room window to see the Christmas lights. In his ____, I was safe and secure. At age ten, he used to wake me up with warm breakfast in bed. Then I was twelve and my dad was ____ all the kids at my birthday party with his magic tricks. I was so ____ of my father for being so ____ and talented. He'd made my party a ____. As I entered my mother's class. I was nervous. My mom looked at me in ____. “Mom, where's Dad?” I asked, “He's working in the ____ on the side of the house!” she answered. And I hurried to my car and ____ back to the yard.“Hey, Dad!” I yelled out and told him about my fears of the last half hour. My dad ____ laughing his typical laugh that was always ___. I was so thankful that I still had my daddy. And so, as I ___ the door to my father's house, we went inside for our usual cup of coffee. Thanks, Daddy, for all the ____ and more importantly, for all your love.
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The data station usually means a (71) unit that provides data for transmission, that accepts transmitted data, and that performs all functions necessary for communication with another functional unit. Data stations may be divided into two kinds, the primary stations and the secondary stations, (72) control functions.
In (73) data link control, the primary station is the data station that supports the primary control functions of the data link, generates commands to be transmitted, and interprets received responses. Specific responsibilities assigned to the primary station include initialization of control signal interchange, organization of data flow and actions regarding error control and error recovery functions. The secondary station executes data link control functions as (74) by the primary station, interprets received commands and (75) responses to be transmitted.
(75)处填()。
A.produces
B.creates
C.generates
D.makes
0.33g
A.成囊材料
B.增塑剂
C.遮光剂
D.防腐剂
E.增稠剂
工作票签发人不得兼任本项工作()
A.工作负责人
B.工作监护人
C.工作许可人
D.参加者
水泥的凝结硬化过程大致可分成凝结期和硬化期。