He () (forget, take) the keys with him, so he had to wait outside his house.
He () (forget, take) the keys with him, so he had to wait outside his house.
相关考题：
You are signing on a deck officer，who will be designated as one of the GMDSS operators，before sailing foreign．Which statement is TRUE ________．A.He/she must have an STCW certificate endorsed as“Valid for Service on Vessels Operating in the GMDSS System”B.He/she must present either an FCC-issued license or a Coast Guard-issued licenseC.You must consult the“List of Qualifications”on the reverse of his/her FCC-issued licenseD.His/her Merchant Mariners Document must have an added endorsement as “Radio Electronics Officer”
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在生产者/消费者问题中，用s表示实施互斥的信号量，e表示与缓冲区空闲空间数量相关的信号量，n表示与缓冲区中数据项个数相关的信号量，下列生产者和消费者的操作（生产者和消费者可并发执行），可能产生死锁的是（）。A．生产者：wait(s); wait(e); append(); signal(n); signal(s);消费者： wait(s); wait(n); take(); signal(e); signal(s);B．生产者：wait(s); wait(e); append(); signal(n); signal(s);消费者： wait(n); wait(s); take(); signal(s); signal(e);C．生产者：wait(e); wait(s); append(); signal(s); signal(n);消费者： wait(s); wait(n); take(); signal(e); signal(s);D．生产者：wait(e); wait(s); append(); signal(s); signal(n);消费者： wait(n); wait(s); take(); signal(s); signa
在生产者/消费者问题中，用s表示互斥信号量，e表示空缓冲区资源信号量，n表示满缓冲区资源信号量，下列生产者和消费者的操作（生产者和消费者可并发执行），可能产生死锁的是（）。A．生产者：wait(s); wait(e); append(); signal(n); signal(s);消费者： wait(s); wait(n); take(); signal(e); signal(s);B．生产者：wait(s); wait(e); append(); signal(n); signal(s);消费者： wait(n); wait(s); take(); signal(s); signal(e);C．生产者：wait(e); wait(s); append(); signal(s); signal(n);消费者： wait(s); wait(n); take(); signal(e); signal(s);D．生产者：wait(e); wait(s); append(); signal(s); signal(n);消费者： wait(n); wait(s); take(); signal(s); signa