255、Mix the material with a spatula.

A. 　拧紧堵头至 6 牛顿

B. 　给堵头磅力矩至 6 牛米。

C. 　测量堵头紧力为 6 牛顿米。

A. 　 Rub the basin with water.

B. 　 Flush the basin with water.

C. 　 Fill the basin with water.

A. 　通过活门的流体必须是可见的

B. 　通过活门的油液必须是透明的

C. 　通过活门的流体必须是连续的

A. 　 This is the maximum portion of flammable vapors in air If the portion is bigger, when an ignition source
touched the gas, it would cause the fire to be diffused.

B. 　 This is the minimum volume of flammable vapors. lf the volume is lower, when the gas contacted with an
ignition source, the fire would not come out.

C. 　 This is the minimum density of flammable vapors in air. if the density was lower, when an ignition 'source
touched the gas, it would not cause the spread of flame.

A. 　 Alternatively, you can do test B.

B. 　 Test A is irreplaceable.

C. 　 Test A is the equivalent of test B.

A. 　 put on the electrical power

B. 　 Energize the ground service network

C. 　 Pressurize the ground service network
参考 B

A. 　 The repair limits are not permitted as special equipment is required.

B. 　 The repair limits are not mentioned as special equipment IS required.

C. 　 The repair limits are not set as special equipment is required.

A. 　 Normally for an aircraft that has tail wheels, you can tow the tail wheels forward. Todor this you can
connect the tow bar to the main landing gear.

B. 　 Usually, for an aircraft that has tail wheels, you can link the tow bar to the main landing gear, thus you can
tow the aircraft forward.

C. 　 For an aircraft that has tail wheels; you can tow the aircraft forward only when the tow bar is linked to the
main landing gear.

A. 　2 毫米的价值是允许的。

B. 　允许使用 2 毫米的价值。%

C. 　允许使用 2 毫米的值。

A. 　把螺帽拧松 1 圈