下列可直接激活蛋白激酶C的分子是
A. IP3
B. PIP2
C. DAG
D. cAMP
E. cGMP
lesson 23 短听力选择 1-1
A. fire men and fire truck
B. passenger steps and coaches
C. doctors and first-aid
D. maintenance personnel
Lesson 23 短听力选择-2
A. controlling problem
B. engine problem
C. wake turbulence
D. radar failure
Lesson 23 短听力选择-3
A. precautionary landing
B. normal landing
C. belly landing
D. crash landing