A-frames are mounted on the bed plate and support （） and cylinder block.

[单选题]（） of the A-frames there is a strong cast iron frame called the scavenging air box.A . At the topB . At the bottomC . In the topD . In the bottom

[单选题]At the top of the A-frames there is a strong cast iron frame called （）.A . cylinder linerB . cylinder coverC . the gear boxD . the scavenging box

[单选题]（） are mounted on and bolted to the bed-plate cross girders.A . The crankshaftB . The crankcaseC . The guide-waysD . The frame

[单选题]A-frames and cylinder block is held together by （） to form a rigid structure.A . connecting rodsB . piston rodsC . tie rodsD . jack-bolt

[单选题]The bed-plate is secured in the longitudinal direction by means of bolts known as （）.A . end-chock boltsB . side-chock boltsC . through boltsD . tie rod

[单选题]On the top of the cylinder is mounted the cylinder cover which is pressed onto （） of the cylinder liner by means of nuts and studs.A . the camshaftB . the flangeC . the ridgeD . the bulge

[名词解释] 实地（Solid plate）

[单选题]Some cranes are mounted in pairs on a common platform. which can be rotated through_____.A．360oB．270oC．180oD．90o

[单选题]On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）A . cooling jacketB . cylinder linerC . piston crownD . cylinder cover

[单选题]Place the plate in a chamber containing ammonia vapour.此句的意思是将层析板（ ）。A．置于密室中B．喷氨水溶液C．置于氨水溶液中D．置于含氨蒸气的密闭容器中E．以上都不对