钢丝绳芯作用是什么？

患者男，37岁，缺失，其余牙无松动，可摘局部义齿修复。

如果采用单侧设计，常出现的义齿不稳定现象是（）。

A.翘动

B.旋转

C.摆动

D.下沉

E.以上都是

船舶电台接收到一个VHF/MFDSC遇险报警，应采取的行动为（）。①无岸台收妥时，进行收妥；②在CH16/2182kHz上收听5min；③通知RCC或海岸电台；④在电台日志中进行记录

A.①②③④

B.②①③④

C.③①②④

D.③②①④

In the second half of each year, many powerful storms are born in the tropical Atlantic and Caribbean seas. Of (91) , only about half a dozen (92) the p, circling winds of 75 miles per hour or more that give them hurricane status, and several usually (93) their way to the coast. There cause millions of dollars of (94) , and bring death to (95) numbers of people.
The great storms that hit the coast start (96) innocent circling disturbances hundreds, even thousands of miles out to sea. As they travel aimlessly over water (97) by the summer sun, they are carried westward by the (98) winds. When conditions are just (99) , warm, moist air flows in (100) the bottom of such a disturbance, moves upward through it and comes out at the top. In the (101) , the moisture in this warm air produces rain, and with it the heat is converted to energy in the form of p winds. As the heat increases, the (102) hurricane begins to swirl in a counter-clockwise motion.
The average life of a hurricane is only about nine days, but it contains almost (103) power than we can imagine. The energy in the heat released by a hurricane’s rainfall in a(n) (104) day would (105) the entire electrical needs of the United States for more than six months. Water, not wind, is the main (106) of death and destruction in a hurricane. A(n) (107) hurricane brings 6-to 12-inch downpours (108) in sudden floods. (109) is the powerful movement of the sea-the mountains of water moving toward the low-pressure hurricane center. The water level (110) as much as 15 feet above normal as it moves toward shore.

A．origins

B．source

C．origin

D．production

属于企业管理部门及职工方面的管理费用是( )。

A．劳动保险费、待业保险费

B．董事会费、职工教育经费

C．聘请中介机构费、咨询费

D．职工教育经费、诉讼费

涂装时中间涂层是可有可无的，因为它只有增加涂层的厚度的作用。