119. An occluded front is caused by a(n)____

As a tornado chaser just waking up in the morning, what meteorological conditions would you seek if you were interested in viewing a tornado that afternoon? (Select all that apply) A: Triggering cold front B: Warm moist air near the Earth's surface C: Warm moist air aloft D: Receding warm front E: Conditional instability in the atmosphere F: Surface high pressure system G: Cold dry air aloft H: Surface low pressure system

30最大容量为n的循环队列,队尾指针为rear,队头指针为front,则队空与队满的条件分别是( )。 A: rear==front，(rear+1)%n==front B: (rear+1)%n==front，(rear-l)%n==front C: rear+1==front，(rear+1)%n==front D: (rear-l)%n==front，rear==front，

In the following statements, which one is right? A: /e/ is a front and high vowel. B: /e/ is a front and low vowel. C: /e/ is a front and mid vowel. D: /e/ is a centraland mid vowel.

最大容量为n的循环队列，队尾指针为rear，队头指针为front，则队空的条件是（ ）。‍ A: (rear+1)%n==front B: rear==front C: rear+1==front D: (rear-l)%n==front