Stressful environments lead to unhealthy behaviors such as poor eating habits, which ________ increase the risk of heart disease.

[A] in turn

[B] in return

[C] by chance

[D] by turns

[单选题]Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous s

[主观题]H．omework_____ontimewillleadtobettergrades.(A)done(B)bedone(C)havingdone(D)tohavebeendone

[主观题]Homework_____ontimewillleadtobettergrades.(A)done(B)bedone(C)havingdone(D)tohavebeendone

[问答题] Lead time的定义？

[名词解释] 引入线 lead line

[单选题]Which cause of the following can lead to the engine not to start on air?（）A . starting air pressure too highB . correct timing of starting air valvesC . three of the starting valves stuckD . the turning gear disengaged

[单选题]Which of the following may lead to the engine NOT to start on air?（）A . starting air pressure too highB . correct timing of starting air valvesC . three of the six starting valves stuckD . the turning gear disengaged

[单选题]Measure （） by means of lead wire.A . the clearance of the main bearingB . the play of the miler bearingC . the gap of the main bearingD . the tolerance of the main bearing

[单选题]It is important to use only pure lead and to choose a thickness of wire which is greater than the normal allowable clearance but （） this amount.A . not less than twiceB . greater at least twice thanC . not greater twice thanD . larger three times tha

[单选题]Adjust （） by means of lead wire.A . the clearance of the main bearingB . the diameter of main bearingC . the gap of main beatingD . the tolerance of main bearing